That was fascinating, and very well done. It&#x27;s not often you see somebody actually creating interactive scripts (and miniature models) of things like particle collisions for a presentation. The availability and the quality of the external links is also highly appreciated (even though sending me to Vsauce might cost me another evening). A couple of suggestions for improvement:<p>An estimate for how long the lesson will take (on average), best stated up front.<p>An indicator for where we are in the presentation (like &quot;slide 5 of 18&quot;).<p>A way to pause the audio in the middle of a slide (I just saw you already addressed this one).<p>On the &quot;Corrections&quot; slide, you mention a fascinating PBS documentary. It would be nice to get a link to that, too (if available).