fun

Feynman - Fun to Imagine

These videos are from the 1983 BBC program(me) Fun to Imagine, in which Richard Feynman talks about how mind-bogglingly awesome the world is. I haven't seen all of these yet, but my favorites so far are The Train and Seeing Things.

A neat way to waste some time

Hell of Sand physics sim. (Resource intensive Java applet)

wxSand, a standalone variant.

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No problem is so formidable that you can't just walk away from it.