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I believe she says "pie", and not "pot".

Definitely pie. On Tau Day the Khan Academy office was graced with a wonderful tau (two pie).

You sure about that? I heard pot. Maybe I just "wanted" to hear pot. I'll listen again.

I don't think it would be wise for a kids education site to reference pot.

Ok ok.. I still hear "pot".. but that's probably my "New Yorker ears" tuning.

You are right though; since it's aimed at high school, I doubt it's pot. ;(

If it sounds like "pot", doesn't matter if he really said "pie"; chances are many kids are going to hear "pot" too unfortunately.