The value of a paper plane

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 ## Usage
 
 The important files are
-    presentation.pdf    A PDF of the presentation
+
+    presentation.pdf    A PDF of the presentation (prefered)
     presentation.pptx   A PowerPoint of the presentation
 
-All versions of the presentation are identical in content. A html
-version is offered as well.
+All versions of the presentation are identical in content.
+
+A good idea may be not to stick to the presentation, but to use it as
+a guide for a more freeform lesson that discussed paper planes,
+involves the activity of making and throwing them, and also involves
+open thought about the concepts behind them.
 
-A good idea may be not to stick to the presentation, but to 
+There are two videos. The one showing how to fold the John Collins
+aircraft is rather good.
 
 ## Talking points