Not sure where this is from, but I love it.

Sine vs Cosine.gif
sine vs. cosine

Update: Mike pointed out in the comments that it's sometimes called a "bullshit grinder" which lead me to a Wikipedia article with a little more information.


Michal Migurski

They used to sell these at a knickknack store in New Haven when I was a kid, under the name "bullshit grinder".


ooh! reminds me of one of my favorite wikipedia animations: (see also:


I have a wooden one of those.

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before this i wrote transparent post-it after this i wrote zappos pays people to quit


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