christopher columbus...

...was wrong!

Actually, and I just found this out (and of course I can't remember where), the Earth isn't a perfect sphere, but is pear-shaped. Also, I know Christopher Columbus wasn't the first to think the world was round, but in elementary school that's what we were always taught.

Edit: Okay, I guess I should've written slightly pear-shaped! More elliptical with bulges at the poles and near the equator. More info here.

Source: Nick Tassone