diff --git a/00-before-we-start.html b/00-before-we-start.html
index 4ad2ff216..01a375b95 100644
--- a/00-before-we-start.html
+++ b/00-before-we-start.html
@@ -664,7 +664,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-06-05",
-  "datePublished": "2024-01-23"
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 }
 
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diff --git a/01-short-introduction-to-Python.html b/01-short-introduction-to-Python.html
index 9318833aa..e927cc246 100644
--- a/01-short-introduction-to-Python.html
+++ b/01-short-introduction-to-Python.html
@@ -1011,7 +1011,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/01-short-introduction-to-Python.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-06-13",
-  "datePublished": "2024-01-23"
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diff --git a/02-starting-with-data.html b/02-starting-with-data.html
index ad2c695ed..ea0f0e914 100644
--- a/02-starting-with-data.html
+++ b/02-starting-with-data.html
@@ -695,7 +695,7 @@ <h3 class="callout-title">Challenge - DataFrames<a class="anchor" aria-label="an
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
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 </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>
 <code>surveys_df.columns</code> provides the names of the columns in
@@ -782,7 +782,7 @@ <h3 class="callout-title">Challenge - Statistics<a class="anchor" aria-label="an
 <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><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>
@@ -906,7 +906,7 @@ <h3 class="callout-title">Challenge - Summary Data<a class="anchor" aria-label="
 <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" 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">
 <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
@@ -1005,7 +1005,7 @@ <h3 class="callout-title">Challenge - Make a list<a class="anchor" aria-label="a
 <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" 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>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
@@ -1128,7 +1128,7 @@ <h3 class="callout-title">Challenge - Plots<a class="anchor" aria-label="anchor"
 <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" 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">
 <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>
@@ -1190,7 +1190,7 @@ <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" 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">
 <p>First we group data by site and by sex, and then calculate a total
 for each site.</p>
@@ -1335,7 +1335,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/02-starting-with-data.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-29",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
 }
 
   </script><script>
diff --git a/03-index-slice-subset.html b/03-index-slice-subset.html
index c10cde9e8..051aa347e 100644
--- a/03-index-slice-subset.html
+++ b/03-index-slice-subset.html
@@ -517,7 +517,7 @@ <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="#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">
 <ol style="list-style-type: decimal"><li><p><code>a[0]</code> returns <code>1</code>, as Python starts with
 element 0 (this may be different from what you have previously
@@ -783,7 +783,7 @@ <h3 class="callout-title">Challenge - Range<a class="anchor" aria-label="anchor"
 <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">Selection Challenges</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>
 <ul><li>
@@ -939,7 +939,7 @@ <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="#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>
 <div class="codewrapper sourceCode" id="cb32">
@@ -1130,7 +1130,7 @@ <h3 class="callout-title">Challenge - Putting it all together<a class="anchor" a
 <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">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>
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@@ -1247,7 +1247,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/03-index-slice-subset.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-08-18",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
 }
 
   </script><script>
diff --git a/04-data-types-and-format.html b/04-data-types-and-format.html
index b7b97ccee..864bbb018 100644
--- a/04-data-types-and-format.html
+++ b/04-data-types-and-format.html
@@ -609,7 +609,7 @@ <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="#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">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -758,7 +758,7 @@ <h3 class="callout-title">Counting<a class="anchor" aria-label="anchor" href="#c
 <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">Hints</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 method <code>.count()</code> gives you the number of non-NaN
 observations per column. Try looking to the <code>.isna()</code>
@@ -768,7 +768,7 @@ <h4 class="accordion-header" id="headingSolution3">Hints</h4>
 <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">
 <div class="codewrapper sourceCode" id="cb36">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -937,7 +937,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/04-data-types-and-format.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-06-05",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
 }
 
   </script><script>
diff --git a/05-merging-data.html b/05-merging-data.html
index 6df692cb6..52ba8e174 100644
--- a/05-merging-data.html
+++ b/05-merging-data.html
@@ -1008,7 +1008,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/05-merging-data.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-19",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
 }
 
   </script><script>
diff --git a/06-loops-and-functions.html b/06-loops-and-functions.html
index 6542bbf50..366f6c077 100644
--- a/06-loops-and-functions.html
+++ b/06-loops-and-functions.html
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 <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>
 <div class="codewrapper sourceCode" id="cb9">
@@ -691,7 +691,7 @@ <h3 class="callout-title">Challenge - Modifying loops<a class="anchor" aria-labe
 <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><div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -813,7 +813,7 @@ <h3 class="callout-title">Challenge - Functions<a class="anchor" aria-label="anc
 <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" 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">
 <ol style="list-style-type: decimal"><li>
 <p>For example, using an integer and a string:</p>
@@ -1078,7 +1078,7 @@ <h3 class="callout-title">Challenge: More functions<a class="anchor" aria-label=
 <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" 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">
 <ol style="list-style-type: decimal"><li><div class="codewrapper sourceCode" id="cb55">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1272,7 +1272,7 @@ <h3 class="callout-title">Challenge - Variables<a class="anchor" aria-label="anc
 <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" 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">
 <ol style="list-style-type: decimal"><li>
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@@ -1483,7 +1483,7 @@ <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">Show me the solution</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">
 <ol style="list-style-type: decimal"><li><div class="codewrapper sourceCode" id="cb75">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1701,7 +1701,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/06-loops-and-functions.html",
   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-18",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
 }
 
   </script><script>
diff --git a/07-visualization-ggplot-python.html b/07-visualization-ggplot-python.html
index aa97d0fec..2fb819e96 100644
--- a/07-visualization-ggplot-python.html
+++ b/07-visualization-ggplot-python.html
@@ -475,7 +475,7 @@ <h3 class="callout-title">Challenge - bar chart<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
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 </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="cb8">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -606,7 +606,7 @@ <h3 class="callout-title">Challenge - Bar plot adaptations<a class="anchor" aria
 <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">Answers</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="cb16">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -685,7 +685,7 @@ <h3 class="callout-title">Challenge - distributions<a class="anchor" aria-label=
 <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">Answers</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="cb19">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -833,7 +833,7 @@ <h3 class="callout-title">Challenge - facetting<a class="anchor" aria-label="anc
 <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">Answers</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="cb28">
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@@ -868,7 +868,7 @@ <h3 class="callout-title">Challenge - facetting<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
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 </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">
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 <div class="codewrapper sourceCode" id="cb29">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1042,7 +1042,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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diff --git a/index.html b/index.html
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--- a/index.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">
 <ol style="list-style-type: decimal"><li><p>Open <a href="https://www.anaconda.com/products/individual" class="external-link">https://www.anaconda.com/products/individual</a>
 in your web browser.</p></li>
@@ -434,7 +434,7 @@ <h4 id="video-tutorial">Video Tutorial<a class="anchor" aria-label="anchor" href
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 in your web browser.</p></li>
@@ -473,7 +473,7 @@ <h4 id="video-tutorial-1">Video Tutorial<a class="anchor" aria-label="anchor" hr
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <p>Note that the following installation steps require you to work from
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@@ -631,8 +631,8 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
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diff --git a/instructor/01-short-introduction-to-Python.html b/instructor/01-short-introduction-to-Python.html
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diff --git a/instructor/02-starting-with-data.html b/instructor/02-starting-with-data.html
index 1727312b0..ac83dd8a8 100644
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 <p>Working through solutions to the challenge above can provide a good
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><code>site_names = pd.unique(surveys_df["plot_id"])</code></li>
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@@ -859,7 +859,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 <p>In pandas prior to version 0.18.1 there is a bug causing
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@@ -945,7 +945,7 @@ <h3 class="callout-title">Challenge - Summary Data<a class="anchor" aria-label="
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 <ol style="list-style-type: decimal"><li>The first column of output from <code>grouped_data.describe()</code>
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@@ -1044,7 +1044,7 @@ <h3 class="callout-title">Challenge - Make a list<a class="anchor" aria-label="a
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 <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
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 <ol style="list-style-type: decimal"><li><code>surveys_df.groupby('plot_id').mean()["weight"].plot(kind='bar')</code></li>
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 <div class="accordion-body">
 <p>First we group data by site and by sex, and then calculate a total
 for each site.</p>
@@ -1374,7 +1374,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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 <p>Tip: use <code>.head()</code> method throughout this lesson to keep
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>a[0]</code> returns <code>1</code>, as Python starts with
 element 0 (this may be different from what you have previously
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>
 <div class="codewrapper sourceCode" id="cb32">
@@ -1050,7 +1050,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <div class="accordion-body">
 <p>When working through the solutions to the challenges above, you could
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 <ol style="list-style-type: decimal"><li>
 <div class="codewrapper sourceCode" id="cb47">
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 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div>Instructor Note</h3>
 </button>
-<div id="collapseInstructor3" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor3" aria-labelledby="headingInstructor3">
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 <div class="accordion-body">
 <p>Referring to the challenge solution above, as we know the other
 values are all Nan values, we could also select all not null values:</p>
@@ -1311,7 +1311,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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@@ -760,7 +760,7 @@ <h3 class="callout-title">Counting<a class="anchor" aria-label="anchor" href="#c
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+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The method <code>.count()</code> gives you the number of non-NaN
 observations per column. Try looking to the <code>.isna()</code>
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 <div class="accordion-body">
 <p>If learners have trouble generating the output, or anything happens
 with that, the folder <a href="https://github.com/datacarpentry/python-ecology-lesson/tree/main/sample_output" class="external-link"><code>sample_output</code></a>
@@ -954,7 +954,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-06-05",
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 <p>When working through the solutions to the challenges above, you could
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 <p>The method <code>.count()</code> gives you the number of non-NaN
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 <p>When teaching the challenge below, demonstrating the results in a
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 <p>If learners have trouble generating the output, or anything happens
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 <p>Note <code>plotnine</code> contains a <em>lot</em> of deprecation
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@@ -6445,7 +6445,7 @@ <h3 class="callout-title">Challenge - bar chart<a class="anchor" aria-label="anc
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-<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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 <p>Note that the following installation steps require you to work from
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   "dateCreated": "2015-03-19",
-  "dateModified": "2024-01-23",
-  "datePublished": "2024-01-23"
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index b0513a368..c3a8cfea7 100644
--- a/instructor/profiles.html
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@@ -315,8 +315,8 @@ <h1>Learner Profiles</h1>
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   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/instructor/profiles.html",
   "dateCreated": "2015-03-19",
-  "dateModified": "2024-01-23",
-  "datePublished": "2024-01-23"
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index 0dabc1188..d0a98e1e0 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -493,7 +493,7 @@ <h1>Glossary</h1>
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   "dateModified": "2023-05-08",
-  "datePublished": "2024-01-23"
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diff --git a/jupyter_notebooks.html b/jupyter_notebooks.html
index 731e85432..a72e219d3 100644
--- a/jupyter_notebooks.html
+++ b/jupyter_notebooks.html
@@ -455,7 +455,7 @@ <h3 id="help-and-more-information">Help and more information<a class="anchor" ar
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-08",
-  "datePublished": "2024-01-23"
+  "datePublished": "2024-01-30"
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diff --git a/key-points.html b/key-points.html
index 71fce01dd..952591125 100644
--- a/key-points.html
+++ b/key-points.html
@@ -496,8 +496,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
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   "identifier": "https://datacarpentry.github.io/python-ecology-lesson/key-points.html",
   "dateCreated": "2015-03-19",
-  "dateModified": "2024-01-23",
-  "datePublished": "2024-01-23"
+  "dateModified": "2024-01-30",
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diff --git a/pkgdown.yml b/pkgdown.yml
index 7b856e493..2585a0ee1 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
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+last_built: 2024-01-30T00:14Z
 
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index bdae8397f..bfe6f6649 100644
--- a/profiles.html
+++ b/profiles.html
@@ -315,8 +315,8 @@ <h1>Learner Profiles</h1>
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-  "dateModified": "2024-01-23",
-  "datePublished": "2024-01-23"
+  "dateModified": "2024-01-30",
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 }
 
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diff --git a/reference.html b/reference.html
index e0c64719c..7057cb28d 100644
--- a/reference.html
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@@ -491,7 +491,7 @@ <h1>Glossary</h1>
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   "dateCreated": "2015-03-19",
   "dateModified": "2023-05-08",
-  "datePublished": "2024-01-23"
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