There's some advice
here. Not that I take it seriously, but I would quite like to get a teeshirt that illustrates Pythagoras nicely.
Aren't we overlooking the obvious? Most existing data indicate that aliens aren't as interested in doing high school geometry as in, um, you know. All I can say is that I'm packing some KY in my alien kit.
As for the T shirt illustration, I think you want something like this on your chest, perhaps without the words or algebraic symbols:
Previous Topic
Index
