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Another great one: http://www.toothpastefordinner.com/031208/how-many-digits-of...

Added bonus: hover your mouse over the red button beneath the image.

I'd guess that most scientists know six digits of π: 3.14159.</pedantry>

I think most scientists know pi to 4 characters: M_PI

Most of the time, I use \pi.

So close! You even used the one digit in your comment...

A nice burn against the xkcd SCIENCE! crowd and their adolescent boosterism.

I linked to it in the "Mathematical and Scientific Joke Competition" thread: http://news.ycombinator.com/item?id=1089188

Amongst my scientist friends, xkcd is a favourite.

Hmm. I'm a mathematician/computer scientist and I know significantly more than 1 digit of pi. What does that make me, hmm? :-)

Offhand (mentally recites pi) I can come up with about 10 digits without using a calculator. If I ever need an approximation to pi to do a calculation, though, I go with either 22/7, 355/113, or 3.14159.

It's a joke, not a challenge.

Suddenly this seems relevant again:

http://www.stanford.edu/~pgbovine/geek-behaviors.htm

(particularly the Obsessing over correctness and completeness bit).

HINT: the one digit ain't in ASCII

Science Fan vs. Scientist