diff --git a/01-rstudio-intro.html b/01-rstudio-intro.html
index e2c38b3c9..1ee41fbc5 100644
--- a/01-rstudio-intro.html
+++ b/01-rstudio-intro.html
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diff --git a/02-project-intro.html b/02-project-intro.html
index e2f0ec3eb..cd7661cc7 100644
--- a/02-project-intro.html
+++ b/02-project-intro.html
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diff --git a/03-seeking-help.html b/03-seeking-help.html
index e73ad3d5d..bf4cad462 100644
--- a/03-seeking-help.html
+++ b/03-seeking-help.html
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diff --git a/04-data-structures-part1.html b/04-data-structures-part1.html
index aab703cb1..0241dd223 100644
--- a/04-data-structures-part1.html
+++ b/04-data-structures-part1.html
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diff --git a/05-data-structures-part2.html b/05-data-structures-part2.html
index cd56db4e3..09f78bdf2 100644
--- a/05-data-structures-part2.html
+++ b/05-data-structures-part2.html
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   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -986,7 +986,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1046,7 +1046,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1098,7 +1098,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1192,7 +1192,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateModified": "2024-12-03",
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diff --git a/06-data-subsetting.html b/06-data-subsetting.html
index 264e2c347..26ea09c3f 100644
--- a/06-data-subsetting.html
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   </h4>
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-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1174,7 +1174,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
@@ -1452,7 +1452,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -1597,7 +1597,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1662,7 +1662,7 @@ <h4 class="accordion-header" id="headingSolution6">
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   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1889,7 +1889,7 @@ <h4 class="accordion-header" id="headingSolution8">
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 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <ol style="list-style-type: decimal"><li><p><code>gapminder</code> is a data.frame so needs to be subsetted
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@@ -1981,7 +1981,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/07-control-flow.html b/07-control-flow.html
index 02c8ab6d6..fd6cbdc42 100644
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diff --git a/08-plot-ggplot2.html b/08-plot-ggplot2.html
index ad80d6dce..c32ba24c1 100644
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diff --git a/09-vectorization.html b/09-vectorization.html
index 1621adac7..951b31e7b 100644
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diff --git a/10-functions.html b/10-functions.html
index 17715450b..96d73c92d 100644
--- a/10-functions.html
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -757,7 +757,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <p>Extend our previous definition of the function by adding in an
 explicit call to <code>stopifnot()</code>. Since
@@ -1011,7 +1011,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="codewrapper sourceCode" id="cb32">
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@@ -1069,7 +1069,7 @@ <h4 class="accordion-header" id="headingSolution5">
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   </h4>
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-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -1221,7 +1221,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/11-writing-data.html b/11-writing-data.html
index 501d4d589..075aba1cb 100644
--- a/11-writing-data.html
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   "dateModified": "2024-12-03",
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diff --git a/12-dplyr.html b/12-dplyr.html
index 1b4f1f1c8..61b555fbb 100644
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="codewrapper sourceCode" id="cb23">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1139,7 +1139,7 @@ <h4 class="accordion-header" id="headingSolution3">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="codewrapper sourceCode" id="cb52">
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@@ -1248,7 +1248,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/13-tidyr.html b/13-tidyr.html
index 1ae508535..7a4253e10 100644
--- a/13-tidyr.html
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diff --git a/14-knitr-markdown.html b/14-knitr-markdown.html
index 64349d2bf..93f9fbfc6 100644
--- a/14-knitr-markdown.html
+++ b/14-knitr-markdown.html
@@ -584,7 +584,7 @@ <h4 class="accordion-header" id="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -660,7 +660,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <pre>
 ```{r load-ggplot2}
@@ -745,7 +745,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <pre>
 ```{r echo = FALSE, fig.width = 3}
@@ -793,7 +793,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = <code>4</code>.</p>
 </div>
@@ -936,7 +936,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/15-wrap-up.html b/15-wrap-up.html
index 7b5c8084f..4f8154d6e 100644
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diff --git a/404.html b/404.html
index 5eaa154f0..8a3d31dd4 100644
--- a/404.html
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-  "dateModified": "2024-12-24",
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index f4db71619..56a2ed3ac 100644
--- a/CODE_OF_CONDUCT.html
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diff --git a/LICENSE.html b/LICENSE.html
index 4c6d5cb5f..0497735f4 100644
--- a/LICENSE.html
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diff --git a/aio.html b/aio.html
index 34621595d..93da3e1f5 100644
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+++ b/aio.html
@@ -4610,7 +4610,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
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   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4961,7 +4961,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
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@@ -5013,7 +5013,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
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   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
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   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5835,7 +5835,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ul>
 <li>The <strong>wrong</strong> way to do this problem is
@@ -6126,7 +6126,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -6273,7 +6273,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6338,7 +6338,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to challenge 6
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6504,7 +6504,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Solution to challenge 7
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal">
@@ -6589,7 +6589,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to challenge 8
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p><code>gapminder</code> is a data.frame so needs to be subsetted
@@ -8845,7 +8845,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
 temperature in Kelvin and returns that temperature in Celsius</p>
@@ -8903,7 +8903,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -9038,7 +9038,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Extend our previous definition of the function by adding in an
 explicit call to <code>stopifnot()</code>. Since
@@ -9296,7 +9296,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="codewrapper sourceCode" id="cb32">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9354,7 +9354,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -9949,7 +9949,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10083,7 +10083,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="codewrapper sourceCode" id="cb23">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10451,7 +10451,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Advanced Challenge
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb52">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -11424,7 +11424,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -11506,7 +11506,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <pre>
 ```{r load-ggplot2}
@@ -11597,7 +11597,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <pre>
 ```{r echo = FALSE, fig.width = 3}
@@ -11647,7 +11647,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = <code>4</code>.</p>
 </div>
@@ -11936,8 +11936,8 @@ <h3 class="callout-title">Key Points</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/aio.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/aio.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
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diff --git a/discuss.html b/discuss.html
index eaece6f0d..23bd7a45a 100644
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   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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diff --git a/images.html b/images.html
index a5e9cd646..d4fba47e6 100644
--- a/images.html
+++ b/images.html
@@ -654,8 +654,8 @@ <h3 id="14-knitr-markdown-figure-3">Figure 3</h3>
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   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/images.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
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diff --git a/index.html b/index.html
index 86380ec51..6bdb1af02 100644
--- a/index.html
+++ b/index.html
@@ -478,8 +478,8 @@ <h3 class="callout-title">Prerequisites</h3>
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-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
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diff --git a/instructor-notes.html b/instructor-notes.html
index 0df8a95d3..44402692b 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -661,8 +661,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
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   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
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diff --git a/instructor/01-rstudio-intro.html b/instructor/01-rstudio-intro.html
index ae53a49c9..7ae6816fc 100644
--- a/instructor/01-rstudio-intro.html
+++ b/instructor/01-rstudio-intro.html
@@ -1484,7 +1484,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
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diff --git a/instructor/02-project-intro.html b/instructor/02-project-intro.html
index 51f216caa..09fe0e209 100644
--- a/instructor/02-project-intro.html
+++ b/instructor/02-project-intro.html
@@ -824,7 +824,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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diff --git a/instructor/03-seeking-help.html b/instructor/03-seeking-help.html
index b6bc30333..a23f3baf6 100644
--- a/instructor/03-seeking-help.html
+++ b/instructor/03-seeking-help.html
@@ -865,7 +865,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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diff --git a/instructor/04-data-structures-part1.html b/instructor/04-data-structures-part1.html
index 119da5b3a..49a7265a6 100644
--- a/instructor/04-data-structures-part1.html
+++ b/instructor/04-data-structures-part1.html
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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diff --git a/instructor/05-data-structures-part2.html b/instructor/05-data-structures-part2.html
index 3c9ef6912..9e26514b0 100644
--- a/instructor/05-data-structures-part2.html
+++ b/instructor/05-data-structures-part2.html
@@ -706,7 +706,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -988,7 +988,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1048,7 +1048,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1100,7 +1100,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1194,7 +1194,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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diff --git a/instructor/06-data-subsetting.html b/instructor/06-data-subsetting.html
index 1730e4540..fdf5738e9 100644
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+++ b/instructor/06-data-subsetting.html
@@ -740,7 +740,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -925,7 +925,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1176,7 +1176,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
@@ -1454,7 +1454,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -1599,7 +1599,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1664,7 +1664,7 @@ <h4 class="accordion-header" id="headingSolution6">
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1818,7 +1818,7 @@ <h4 class="accordion-header" id="headingSolution7">
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-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1891,7 +1891,7 @@ <h4 class="accordion-header" id="headingSolution8">
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 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>gapminder</code> is a data.frame so needs to be subsetted
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@@ -1983,7 +1983,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/instructor/07-control-flow.html b/instructor/07-control-flow.html
index 0acf513f9..a84359ead 100644
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diff --git a/instructor/08-plot-ggplot2.html b/instructor/08-plot-ggplot2.html
index fc72ccb53..df7205a80 100644
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diff --git a/instructor/09-vectorization.html b/instructor/09-vectorization.html
index eae6e2aca..09d95b589 100644
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diff --git a/instructor/10-functions.html b/instructor/10-functions.html
index 64e3d899f..db0422308 100644
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   </h4>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
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@@ -627,7 +627,7 @@ <h4 class="accordion-header" id="headingSolution2">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
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@@ -759,7 +759,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <p>Extend our previous definition of the function by adding in an
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@@ -1013,7 +1013,7 @@ <h4 class="accordion-header" id="headingSolution4">
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-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <p>Write a function called <code>fence()</code> that takes two vectors
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@@ -1223,7 +1223,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/instructor/11-writing-data.html b/instructor/11-writing-data.html
index 3827f628c..58595185f 100644
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diff --git a/instructor/12-dplyr.html b/instructor/12-dplyr.html
index f2910d0ea..305ef0994 100644
--- a/instructor/12-dplyr.html
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   Solution to Challenge 1
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="codewrapper sourceCode" id="cb52">
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diff --git a/instructor/13-tidyr.html b/instructor/13-tidyr.html
index b87f32934..e4596b6ed 100644
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diff --git a/instructor/14-knitr-markdown.html b/instructor/14-knitr-markdown.html
index 1d206ebfa..4af6517bd 100644
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -662,7 +662,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <pre>
 ```{r load-ggplot2}
@@ -747,7 +747,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <pre>
 ```{r echo = FALSE, fig.width = 3}
@@ -795,7 +795,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = <code>4</code>.</p>
 </div>
@@ -938,7 +938,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/instructor/15-wrap-up.html b/instructor/15-wrap-up.html
index a0ccde1f9..5fdd78b82 100644
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diff --git a/instructor/404.html b/instructor/404.html
index dcffcf3b6..ded8e5cce 100644
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   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/404.html",
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-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
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diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index c065bf314..433f4ca2d 100644
--- a/instructor/CODE_OF_CONDUCT.html
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diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 2809be48b..283773b4f 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
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diff --git a/instructor/aio.html b/instructor/aio.html
index 0dfc47dab..fa76ee065 100644
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4989,7 +4989,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <p>The <code>source</code> function can be used to use a script within a
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@@ -5041,7 +5041,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
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@@ -5417,7 +5417,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5864,7 +5864,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <ul>
 <li>The <strong>wrong</strong> way to do this problem is
@@ -6155,7 +6155,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <p>D</p>
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-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6367,7 +6367,7 @@ <h4 class="accordion-header" id="headingSolution6">
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-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6533,7 +6533,7 @@ <h4 class="accordion-header" id="headingSolution7">
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-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal">
@@ -6618,7 +6618,7 @@ <h4 class="accordion-header" id="headingSolution8">
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   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <ol style="list-style-type: decimal">
 <li><p><code>gapminder</code> is a data.frame so needs to be subsetted
@@ -8878,7 +8878,7 @@ <h4 class="accordion-header" id="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
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@@ -8936,7 +8936,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -9071,7 +9071,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Extend our previous definition of the function by adding in an
 explicit call to <code>stopifnot()</code>. Since
@@ -9329,7 +9329,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb32">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9387,7 +9387,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -9984,7 +9984,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10118,7 +10118,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb23">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10486,7 +10486,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Advanced Challenge
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb52">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -11461,7 +11461,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -11543,7 +11543,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <pre>
 ```{r load-ggplot2}
@@ -11634,7 +11634,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <pre>
 ```{r echo = FALSE, fig.width = 3}
@@ -11684,7 +11684,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = <code>4</code>.</p>
 </div>
@@ -11974,8 +11974,8 @@ <h3 class="callout-title">Key Points</h3>
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   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/aio.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
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diff --git a/instructor/discuss.html b/instructor/discuss.html
index ffdb0dc28..61b37fca2 100644
--- a/instructor/discuss.html
+++ b/instructor/discuss.html
@@ -462,7 +462,7 @@ <h1>Discussion</h1>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
 }
 
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diff --git a/instructor/images.html b/instructor/images.html
index 4baf01fd9..509ae488d 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -656,8 +656,8 @@ <h3 id="14-knitr-markdown-figure-3">Figure 3</h3>
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   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/images.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index 841b4bb52..818501448 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -629,8 +629,8 @@ <h3 class="callout-title">Prerequisites</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/index.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/index.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index e1dbbdce2..ff9ff9efb 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -694,8 +694,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/instructor-notes.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/instructor-notes.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index b281a43ef..fae00550b 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -633,8 +633,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/key-points.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/key-points.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
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diff --git a/instructor/profiles.html b/instructor/profiles.html
index bed714cfe..caff97199 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -417,8 +417,8 @@ <h1>Learner Profiles</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/profiles.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/profiles.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index b9d5e16d3..b32ea933d 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -938,7 +938,7 @@ <h1>Reference</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/reference.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index 2211dab7c..9d2b36bb2 100644
--- a/key-points.html
+++ b/key-points.html
@@ -631,8 +631,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/r-novice-gapminder/key-points.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/key-points.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index f2cc99ed3..02f2368cc 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,4 +2,4 @@ pandoc: 3.1.11
 pkgdown: 2.1.1
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-12-24T00:17Z
+last_built: 2024-12-31T00:17Z
diff --git a/profiles.html b/profiles.html
index d446101b1..a27652118 100644
--- a/profiles.html
+++ b/profiles.html
@@ -417,8 +417,8 @@ <h1>Learner Profiles</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/profiles.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/profiles.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
+  "dateModified": "2024-12-31",
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index 604e1efe5..0e69600ca 100644
--- a/reference.html
+++ b/reference.html
@@ -936,7 +936,7 @@ <h1>Reference</h1>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-12-03",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
 }
 
   </script><script>