diff --git a/.gitignore b/.gitignore
index a8e46f9..9a540bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,3 +41,4 @@ services/.DS_Store
 course/.DS_Store
 course/introduction/~$introduction.pptx
 course/.DS_Store
+course/geography/~$geography.pptx
diff --git a/course/.DS_Store b/course/.DS_Store
index 81f2b88..6f8f87e 100644
Binary files a/course/.DS_Store and b/course/.DS_Store differ
diff --git a/course/geography/~$geography.pptx b/course/geography/~$geography.pptx
deleted file mode 100644
index 8cf8149..0000000
Binary files a/course/geography/~$geography.pptx and /dev/null differ
diff --git a/course/taxonomy/index.html b/course/taxonomy/index.html
index 1319610..764e265 100755
--- a/course/taxonomy/index.html
+++ b/course/taxonomy/index.html
@@ -163,9 +163,13 @@ <h3>Synonyms</h3>
 <p>Bonus question: why has the frequency of usage of names for the <a href="http://synynyms.com/taxon/326924" target="_new"><i>Cavia porcellus</i> (the guinea pig)</a> declined in the 20th century?</p>
 </div>
 
-<div class="example">
+<div class="warning">
+
+<p>An alternative to synynyms is to use the timeline feature in BioStor, 
+e.g. <a href="http://biostor.org/timeline.php?q=Aspidoscelis%20costata,%20Cnemidophorus%20costatus">compare <i>Aspidoscelis costata</i> with <i>Cnemidophorus costatus</i></a>
+<strike>This feature is offline.</strike>
 
-<p>An alternative to synynyms is to use the timeline feature in BioStor, e.g. <a href="http://biostor.org/timeline.php?q=Aspidoscelis%20costata,%20Cnemidophorus%20costatus">compare <i>Aspidoscelis costata</i> with <i>Cnemidophorus costatus</i></a></p>
+</p>
 
 </div>
 
@@ -308,6 +312,40 @@ <h3>Visualing classifications</h3>
 
 </div>
 
+
+
+<div class="example">
+
+<b>Comparing tree visualisations </b>
+
+<p>Create a list of questions to test how useful a tree visualisation is, then evaluate each visualisation.</p>
+
+<p>Possible questions</p>
+
+<ul>
+<li>Can you find a species?</li>
+<li>Can you search using common names?</li>
+<li>Can you find the common ancestor of two species (e.g., human and salmon)?</li>
+<li>Can you get a sense of how many species are in each taxon?</li>
+<li>Do you ever get lost?</li>
+</ul>
+
+<p>Think about other possible questions, and how to test them.</p>
+
+
+<h3>Visualisations</h3>
+
+<ul>
+<li><a href="http://www.onezoom.org/" target="_new">OneZoom</a></li>
+<li><a href="http://lifemap-ncbi.univ-lyon1.fr/" target="_new">OpenTree</a></li>
+<li><a href="https://tree.opentreeoflife.org/" target="_new">LifeMap</a></li>
+</ul>
+
+
+</div>
+
+
+
 <!--
 <iframe src="http://www.mendeley.com/groups/1364223/_/widget/23/3/" frameborder="0" allowTransparency="true" style="width:600px;height:300px;"></iframe><p style="width:600px"><a href="http://www.mendeley.com/groups/1364223/treevis-net/" title="TreeVis.net on Mendeley">TreeVis.net</a> is a group in <a href="http://www.mendeley.com/groups/biological-sciences/" title="Biological Sciences on Mendeley">Biological Sciences</a> on <a href="http://www.mendeley.com/" title="Mendeley">Mendeley</a>.</p>
 -->
@@ -379,6 +417,16 @@ <h2><a name="barcodes"/>Beyond names: DNA barcodes</h2>
 
 </div>
 
+<h2><a name="future"/>Questions to think about</h2>
+
+<ol>
+<li>How many web sites have machine-readable data available?</li>
+<li>How important are taxonomic names to finding biological information?</li>
+<li>How can we deal with the multiple names? Do we try and reconcile across multiple sources, or pick one as definitive?</li>
+<li>What is the best way to browse a taxonomic classification? How would you decide (i.e., what criteria are relevant?)</li>
+</ol>
+
+
 
 
 <h3>Reading</h3>