Just stumbled across this differential tutorial from 1930 in my inexoriable descent into 'dadness'. Thought it fun to share - I think this is an amazing example of how to explain something. The demos follow the line of thought and everything in it is streamlined for conceptual clarity. Absolute win:

http://www.youtube.com/watch?v=K4JhruinbWc&feature=related

(skip to 1:50 to see it start).

I'd conjecture that even if you're no piston-head, the compelling unfolding of the argument is motivation enough to keep watching.

Ahh the good old days.

nic


ps: another more recent addition to this reminiscipackage of nice explanations; Smale's paradox: http://vimeo.com/19900418 (although definitely requires more sticking power)

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