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index 9c13ce92..8ec7e49b 100644
--- a/00-before-we-start.html
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diff --git a/01-short-introduction-to-Python.html b/01-short-introduction-to-Python.html
index db5fcd44..b33d46ea 100644
--- a/01-short-introduction-to-Python.html
+++ b/01-short-introduction-to-Python.html
@@ -771,7 +771,7 @@ <h3 class="callout-title">Tuples <em>vs.</em> Lists</h3>
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   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </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">
 <ol style="list-style-type: decimal"><li>What happens when you execute <code>a_list[1] = 5</code>?</li>
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@@ -931,7 +931,7 @@ <h3 class="callout-title">Changing dictionaries</h3>
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -1060,7 +1060,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/02-starting-with-data.html b/02-starting-with-data.html
index f4f7d745..2dcd169b 100644
--- a/02-starting-with-data.html
+++ b/02-starting-with-data.html
@@ -749,7 +749,7 @@ <h3 class="callout-title">Challenge - DataFrames</h3>
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   <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">
 <ol style="list-style-type: decimal"><li>
 <code>surveys_df.columns</code> provides the names of the columns in
@@ -835,7 +835,7 @@ <h3 class="callout-title">Challenge - Statistics</h3>
 <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">
 <ol style="list-style-type: decimal"><li><code>site_names = pd.unique(surveys_df["plot_id"])</code></li>
 </ol><ul><li>How many unique sites are in the data? <code>site_names.size</code>
@@ -957,7 +957,7 @@ <h3 class="callout-title">Challenge - Summary Data</h3>
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   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The first column of output from <code>grouped_data.describe()</code>
 (count) tells us that the data contains 15690 records for female
@@ -1055,7 +1055,7 @@ <h3 class="callout-title">Challenge - Make a list</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </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>As well as calling <code>count()</code> on the <code>record_id</code>
 column of the grouped DataFrame as above, an equivalent result can be
@@ -1176,7 +1176,7 @@ <h3 class="callout-title">Challenge - Plots</h3>
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   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </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">
 <ol style="list-style-type: decimal"><li><code>surveys_df.groupby('plot_id').mean()["weight"].plot(kind='bar')</code></li>
 </ol><figure><img src="fig/01_chall_bar_meanweight.png" alt="average weight across all species for each plot" class="figure mx-auto d-block"></figure><ol start="2" style="list-style-type: decimal"><li><code>surveys_df.groupby('sex').count()["record_id"].plot(kind='bar')</code></li>
@@ -1237,7 +1237,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Solution to Summary Challenge </h4>
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-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>First we group data by site and by sex, and then calculate a total
 for each site.</p>
@@ -1381,7 +1381,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/03-index-slice-subset.html b/03-index-slice-subset.html
index df955a8c..693ca8c5 100644
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   "dateCreated": "2015-03-19",
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diff --git a/04-data-types-and-format.html b/04-data-types-and-format.html
index 2d701215..6f5a4a83 100644
--- a/04-data-types-and-format.html
+++ b/04-data-types-and-format.html
@@ -982,7 +982,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-06-05",
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   </script><script>
diff --git a/05-merging-data.html b/05-merging-data.html
index 71118845..8cd1dbaf 100644
--- a/05-merging-data.html
+++ b/05-merging-data.html
@@ -549,7 +549,7 @@ <h3 class="callout-title">Challenge - Combine Data</h3>
 <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">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -890,7 +890,7 @@ <h3 class="callout-title">Challenge - Distributions</h3>
 <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>
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -952,7 +952,7 @@ <h3 class="callout-title">Challenge - Diversity Index</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <ol style="list-style-type: decimal"><li><div class="codewrapper sourceCode" id="cb31">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1065,7 +1065,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/06-loops-and-functions.html b/06-loops-and-functions.html
index 70a37924..6eb45b80 100644
--- a/06-loops-and-functions.html
+++ b/06-loops-and-functions.html
@@ -1746,7 +1746,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-18",
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   </script><script>
diff --git a/07-visualization-ggplot-python.html b/07-visualization-ggplot-python.html
index 4e1a2fe1..877e0ba6 100644
--- a/07-visualization-ggplot-python.html
+++ b/07-visualization-ggplot-python.html
@@ -1084,7 +1084,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/07-visualization-ggplot-python.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2024-03-29",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
 }
 
   </script><script>
diff --git a/08-putting-it-all-together.html b/08-putting-it-all-together.html
index 3c739cf3..ce6f375c 100644
--- a/08-putting-it-all-together.html
+++ b/08-putting-it-all-together.html
@@ -863,7 +863,7 @@ <h3 class="callout-title">Key Points</h3>
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/08-putting-it-all-together.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2024-01-31",
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+  "datePublished": "2024-12-31"
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   </script><script>
diff --git a/09-working-with-sql.html b/09-working-with-sql.html
index 0ffed725..63bd494c 100644
--- a/09-working-with-sql.html
+++ b/09-working-with-sql.html
@@ -747,7 +747,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-18",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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   </script><script>
diff --git a/404.html b/404.html
index 581e341c..42f7bf9a 100644
--- a/404.html
+++ b/404.html
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   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/404.html",
   "dateCreated": "2015-03-19",
-  "dateModified": "2024-12-24",
-  "datePublished": "2024-12-24"
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 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index aa61e790..d48249fb 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -421,7 +421,7 @@ <h1>Contributor Code of Conduct</h1>
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-08",
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   </script><script>
diff --git a/CONTRIBUTORS.html b/CONTRIBUTORS.html
index 636d9582..d5d28a85 100644
--- a/CONTRIBUTORS.html
+++ b/CONTRIBUTORS.html
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-08",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
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   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index b4bd7eac..8ab99173 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -469,7 +469,7 @@ <h1>Licenses</h1>
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/LICENSE.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-08",
-  "datePublished": "2024-12-24"
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   </script><script>
diff --git a/aio.html b/aio.html
index 1b037777..499faf1e 100644
--- a/aio.html
+++ b/aio.html
@@ -1170,7 +1170,7 @@ <h3 class="callout-title">Tuples <em>vs.</em> Lists</h3>
 <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" 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">
 <ol style="list-style-type: decimal">
 <li>What happens when you execute <code>a_list[1] = 5</code>?</li>
@@ -1342,7 +1342,7 @@ <h3 class="callout-title">Changing dictionaries</h3>
 <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" 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">
 <ol style="list-style-type: decimal"><li>
 </li></ol>
@@ -1853,7 +1853,7 @@ <h3 class="callout-title">Challenge - DataFrames</h3>
 <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">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>
@@ -1944,7 +1944,7 @@ <h3 class="callout-title">Challenge - Statistics</h3>
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 </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">
 <ol style="list-style-type: decimal">
 <li><code>site_names = pd.unique(surveys_df["plot_id"])</code></li>
@@ -2080,7 +2080,7 @@ <h3 class="callout-title">Challenge - Summary Data</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </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">
 <ol style="list-style-type: decimal">
 <li>The first column of output from <code>grouped_data.describe()</code>
@@ -2187,7 +2187,7 @@ <h3 class="callout-title">Challenge - Make a list</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </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>As well as calling <code>count()</code> on the <code>record_id</code>
 column of the grouped DataFrame as above, an equivalent result can be
@@ -2313,7 +2313,7 @@ <h3 class="callout-title">Challenge - Plots</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </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">
 <ol style="list-style-type: decimal">
 <li><code>surveys_df.groupby('plot_id').mean()["weight"].plot(kind='bar')</code></li>
@@ -2383,7 +2383,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Solution to Summary Challenge </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>First we group data by site and by sex, and then calculate a total
 for each site.</p>
@@ -4205,7 +4205,7 @@ <h3 class="callout-title">Challenge - Combine Data</h3>
 <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">
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 <div class="accordion-body">
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+++ b/reference.html
@@ -546,7 +546,7 @@ <h1>Glossary</h1>
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/reference.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2024-02-21",
-  "datePublished": "2024-12-24"
+  "datePublished": "2024-12-31"
 }
 
   </script><script>