diff --git a/00-intro.html b/00-intro.html
index 3d406c6c..7d3542b5 100644
--- a/00-intro.html
+++ b/00-intro.html
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diff --git a/01-format-data.html b/01-format-data.html
index 9030c828..9d5bcd61 100644
--- a/01-format-data.html
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diff --git a/02-common-mistakes.html b/02-common-mistakes.html
index 744b3867..9480a6b8 100644
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diff --git a/03-dates-as-data.html b/03-dates-as-data.html
index cdc6d6f0..c57c6efc 100644
--- a/03-dates-as-data.html
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   "dateCreated": "2018-04-13",
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diff --git a/04-quality-control.html b/04-quality-control.html
index 1d1653db..6dbd6f7d 100644
--- a/04-quality-control.html
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@@ -423,7 +423,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>Click the <kbd>Sort</kbd> button on the <kbd>Data</kbd> tab in Excel.
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@@ -469,7 +469,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
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 <div class="accordion-body">
 <p>We can now quickly see the two outlier cells with the value of
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@@ -553,7 +553,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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diff --git a/05-exporting-data.html b/05-exporting-data.html
index ef462b8f..a07d1535 100644
--- a/05-exporting-data.html
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@@ -486,7 +486,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2018-04-13",
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diff --git a/06-data-formats-caveats.html b/06-data-formats-caveats.html
index 31b7ebd6..04886678 100644
--- a/06-data-formats-caveats.html
+++ b/06-data-formats-caveats.html
@@ -433,7 +433,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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diff --git a/404.html b/404.html
index 68d5433f..fac88b70 100644
--- a/404.html
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-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index db1c9722..ef73ba1d 100644
--- a/CODE_OF_CONDUCT.html
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diff --git a/LICENSE.html b/LICENSE.html
index d060d6c9..87528cc2 100644
--- a/LICENSE.html
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@@ -388,7 +388,7 @@ <h1>Licenses</h1>
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diff --git a/aio.html b/aio.html
index dde16905..b1b4a040 100644
--- a/aio.html
+++ b/aio.html
@@ -1727,7 +1727,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
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 <div class="accordion-body">
 <p>Click the <kbd>Sort</kbd> button on the <kbd>Data</kbd> tab in Excel.
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@@ -1776,7 +1776,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
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 <div class="accordion-body">
 <p>We can now quickly see the two outlier cells with the value of
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-  "dateModified": "2024-04-02",
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diff --git a/discuss.html b/discuss.html
index 967ea2d0..3799b5f9 100644
--- a/discuss.html
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diff --git a/images.html b/images.html
index f9a25e7e..715653fa 100644
--- a/images.html
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   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
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diff --git a/index.html b/index.html
index 4433ad11..f9691154 100644
--- a/index.html
+++ b/index.html
@@ -435,8 +435,8 @@ <h3 class="callout-title">Data<a class="anchor" aria-label="anchor" href="#data"
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   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
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diff --git a/instructor-notes.html b/instructor-notes.html
index b50b52cb..62cc3357 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -424,8 +424,8 @@ <h4 id="people-are-not-interactive-or-responsive-on-the-exercise">People are not
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   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor-notes.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
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diff --git a/instructor/00-intro.html b/instructor/00-intro.html
index ebaeb7e2..d44a17f7 100644
--- a/instructor/00-intro.html
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@@ -313,7 +313,7 @@ <h3 class="card-title">Objectives</h3>
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+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <ul><li>Introduce that we’re teaching data organization, and that we’re
 using spreadsheets, because most people do data entry in spreadsheets or
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   "dateCreated": "2018-04-13",
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diff --git a/instructor/02-common-mistakes.html b/instructor/02-common-mistakes.html
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   "dateCreated": "2018-04-13",
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diff --git a/instructor/04-quality-control.html b/instructor/04-quality-control.html
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 <div class="accordion-body">
 <p>Click the <kbd>Sort</kbd> button on the <kbd>Data</kbd> tab in Excel.
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 <div class="accordion-body">
 <p>We can now quickly see the two outlier cells with the value of
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diff --git a/instructor/05-exporting-data.html b/instructor/05-exporting-data.html
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 <div class="accordion-body">
 <ul><li>Have the students export their cleaned data as <code>.csv</code>.
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diff --git a/instructor/06-data-formats-caveats.html b/instructor/06-data-formats-caveats.html
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 <ul><li>This is mainly here as a reference if people have questions about
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-  "datePublished": "2024-04-02"
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index 11128e93..96ffd4a4 100644
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diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 4b9736d6..b894c2e5 100644
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index 8b6bf540..551db6a4 100644
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index 77342dbd..6ab2e3da 100644
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@@ -1712,7 +1712,7 @@ <h3 class="card-title">Objectives</h3>
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Narrative Guidance</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p><em>This lesson is optional</em></p>
 <p>The challenge with this lesson is that the instructor’s version of
@@ -1855,7 +1855,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</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>Click the <kbd>Sort</kbd> button on the <kbd>Data</kbd> tab in Excel.
 A pop-up will appear.</p>
@@ -1904,7 +1904,7 @@ <h3 class="callout-title">Exercise<a class="anchor" aria-label="anchor" href="#e
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2">Show me the solution</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>We can now quickly see the two outlier cells with the value of
 <code>0</code> and can also see that these two classes were
@@ -1975,7 +1975,7 @@ <h3 class="card-title">Objectives</h3>
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Narrative Guidance</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <ul>
 <li>Have the students export their cleaned data as <code>.csv</code>.
@@ -2164,7 +2164,7 @@ <h3 class="card-title">Objectives</h3>
   <h3 class="accordion-header" id="headingInstructor1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>This lesson is for reference</h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <ul>
 <li>This is mainly here as a reference if people have questions about
@@ -2293,8 +2293,8 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/aio.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/aio.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/discuss.html b/instructor/discuss.html
index 881c7261..9630e492 100644
--- a/instructor/discuss.html
+++ b/instructor/discuss.html
@@ -340,7 +340,7 @@ <h1>Discussion</h1>
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/discuss.html",
   "dateCreated": "2018-04-13",
   "dateModified": "2023-12-18",
-  "datePublished": "2024-04-02"
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/images.html b/instructor/images.html
index ed59be93..3943e669 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -447,8 +447,8 @@ <h3 id="06-data-formats-caveats-figure-1">Figure 1</h3>
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/images.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/images.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index 9620a386..e4c35773 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -509,8 +509,8 @@ <h3 class="callout-title">Data<a class="anchor" aria-label="anchor" href="#data"
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/index.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/index.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 68aa9949..0696aff2 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -538,8 +538,8 @@ <h3 id="06-data-formats-caveats-headingInstructor1">
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/instructor-notes.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/instructor-notes.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index 08f318ff..494e4ae0 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -411,8 +411,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/key-points.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/key-points.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index 09a45471..7c76c2d5 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -288,8 +288,8 @@ <h1>Learner Profiles</h1>
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/profiles.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/profiles.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index 7d35d8b2..75419f30 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -332,7 +332,7 @@ <h1>FIXME</h1>
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/instructor/reference.html",
   "dateCreated": "2018-04-13",
   "dateModified": "2023-04-21",
-  "datePublished": "2024-04-02"
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index 45a92876..e83334ae 100644
--- a/key-points.html
+++ b/key-points.html
@@ -409,8 +409,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/key-points.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/key-points.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index dd827f3e..93d39da7 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 3.1.11
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-04-02T00:01Z
+last_built: 2024-04-09T00:01Z
 
diff --git a/profiles.html b/profiles.html
index 0633fcde..a2eb5758 100644
--- a/profiles.html
+++ b/profiles.html
@@ -288,8 +288,8 @@ <h1>Learner Profiles</h1>
   "url": "https://librarycarpentry.github.io/lc-spreadsheets/profiles.html",
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/profiles.html",
   "dateCreated": "2018-04-13",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index bfe6deff..7f1c8423 100644
--- a/reference.html
+++ b/reference.html
@@ -330,7 +330,7 @@ <h1>FIXME</h1>
   "identifier": "https://librarycarpentry.github.io/lc-spreadsheets/reference.html",
   "dateCreated": "2018-04-13",
   "dateModified": "2023-04-21",
-  "datePublished": "2024-04-02"
+  "datePublished": "2024-04-09"
 }
 
   </script><script>