diff --git a/source/ch-collaboration.ptx b/source/ch-collaboration.ptx
index 3a22fae..4044a3f 100644
--- a/source/ch-collaboration.ptx
+++ b/source/ch-collaboration.ptx
@@ -271,7 +271,7 @@ the public.
       <p>
 To create a fork of a public repository, press the <q>Fork</q> button
 on its <c>GitHub.com</c> homepage. You can name this fork whatever you like,
-it will be tracke don GitHub as a fork of the original project, with
+it will be tracked on GitHub as a fork of the original project, with
 the ability to make <q>upstream</q> contributions by way of
 pull requests.
       </p>
@@ -279,7 +279,8 @@ pull requests.
     <p>
 Those of us who work in open source typically <em>love</em> getting
 pull requests from random collaborators. For example, if you find a
-typo in this book, you can fxi it by creating a fork at
+typo in this book, you can fxi <!-- except this one, it's a joke :-) -->
+it by creating a fork at
 <url href="https://github.com/StevenClontz/github-for-mathematicians/fork"/>,
 editing the appropriate <c>source/*.ptx</c> file to fix the word,
 and open a pull request.
diff --git a/source/ch-first-repo.ptx b/source/ch-first-repo.ptx
index c5d665b..fe7f704 100644
--- a/source/ch-first-repo.ptx
+++ b/source/ch-first-repo.ptx
@@ -101,7 +101,7 @@ homepage on <c>GitHub.com</c>.
 Finally, you might be interested in visiting the <q>Insights</q>
 tab for your repository, and specifically the <q>Network</q> page.
 It should reveal a graphic similar to <xref ref="fig-git-branches"/>
-visualizing the history of you project across all GitHub collaborators.
+visualizing the history of your project across all GitHub collaborators.
 Right now you don't have any collaborators and just a couple commits,
 but keeping in mind this model for your project history will be
 useful as we juggle various commits and pushes and syncs and so on
diff --git a/source/ch-manim.ptx b/source/ch-manim.ptx
index c847969..0dbdaf0 100644
--- a/source/ch-manim.ptx
+++ b/source/ch-manim.ptx
@@ -17,12 +17,12 @@ This chapter is co-authored by <xref ref="frontmatter">Tien Chih</xref>.
             <ul>
                 <li>
                     <p>
-                        <url>https://www.3blue1brown.com/</url>
+                        <url href="https://www.3blue1brown.com/">https://www.3blue1brown.com/</url>
                     </p>
                 </li>
                 <li>
                     <p>
-                        <url>https://www.youtube.com/c/3blue1brown</url>
+                        <url href="https://www.youtube.com/c/3blue1brown">https://www.youtube.com/c/3blue1brown</url>
                     </p>
                 </li>
             </ul>
@@ -330,21 +330,23 @@ This chapter is co-authored by <xref ref="frontmatter">Tien Chih</xref>.
                     <ul>
                         <li>
                             <p>
-                                <url>https://docs.manim.community/en/stable/index.html</url>.  This is Tien's goto
+                                <url href="https://docs.manim.community/en/stable/index.html">
+                                https://docs.manim.community/en/stable/index.html</url>.  This is Tien's goto
                                 place for FAQ's, working examples etc..
                             </p>
                         </li>
 
                         <li>
                             <p>
-                                <url>https://www.youtube.com/watch?v=KsemDUSJeWk&amp;list=PLwXCBkIf7xBODPeQxULagMeWSK4YtLYog</url>.
+                                <url href="https://www.youtube.com/watch?v=KsemDUSJeWk&amp;list=PLwXCBkIf7xBODPeQxULagMeWSK4YtLYog">
+                                https://www.youtube.com/watch?v=KsemDUSJeWk&amp;list=PLwXCBkIf7xBODPeQxULagMeWSK4YtLYog</url>.
                                 This is a video playlist of Calculus I material authored by Tien.
                             </p>
                         </li>
 
                         <li>
                             <p>
-                                <url>https://www.youtube.com/@MathVisualProofs</url>.
+                                <url href="https://www.youtube.com/@MathVisualProofs">https://www.youtube.com/@MathVisualProofs</url>.
                                 This the youtube video channel <em>Mathematical Visual Proofs</em>
                                 by Dr. Tom Edgar, an expert on Manim.
                             </p>
@@ -352,7 +354,7 @@ This chapter is co-authored by <xref ref="frontmatter">Tien Chih</xref>.
 
                         <li>
                             <p>
-                                <url>https://www.free-stock-music.com/</url>.
+                                <url href="https://www.free-stock-music.com/">https://www.free-stock-music.com/</url>.
                                 This is a website for royalty-free, Creative-Commons
                                 licensed stock music.
                             </p>
@@ -360,8 +362,8 @@ This chapter is co-authored by <xref ref="frontmatter">Tien Chih</xref>.
                     
                         <li>
                             <p>
-                                <url>https://discord.com/invite/bYCyhM9Kz2</url> a Discord for Manim,
-                                people can help here and you can run Python code within the Discord.
+                                <url href="https://discord.com/invite/bYCyhM9Kz2">https://discord.com/invite/bYCyhM9Kz2</url>
+                                a Discord for Manim, people can help here and you can run Python code within the Discord.
                             </p>
                         </li>
                     </ul>
@@ -371,4 +373,4 @@ This chapter is co-authored by <xref ref="frontmatter">Tien Chih</xref>.
         </section>
 
     
-</chapter>
\ No newline at end of file
+</chapter>