That was fascinating, and very well done. It's not often you see somebody actually creating interactive scripts (and miniature models) of things like particle c

That was fascinating, and very well done. It'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: An estimate for how long the lesson will take (on average), best stated up front. An indicator for where we are in the presentation (like "slide 5 of 18"). A way to pause the audio in the middle of a slide (I just saw you already addressed this one). On the "Corrections" slide, you mention a fascinating PBS documentary. It would be nice to get a link to that, too (if available).