Chock Full O' Whatever

Did you know that if you combined all the ants on earth into a massive ball and weighed them the resulting weight would equal that of all humans lumped together into a massive ball and weighed on some improbably large scale? (I read it in National Geographic, so it must be true!) Kind of amazing, no? That's a lot of ants ... It puts things in a weird, yet oddly more balanced perspective.

Can you think of any amazing comparisons of scale that have "blown your mind," as they say? And don't give me that more stars in the universe than grains of sand line (which isn't even true as it turns out).