My friend Herrick Goldman posted this on the stagecraft mailing list.

"In a world where politics asks "why teach critical thinking?" we have this video series, which reminds me of a lighting lecture mr. Parker does... Enjoy And watch the rest of her stuff.."

So, I had to watch. Great video...

Anti-parabola propoganda, plus musing on math class, cardioids, connect the dots, envelopes of lines, even a bit of origami.