wheeler's quantum foam. that should be great. well, if you want, you can come with me. ah, i'd love to, but i'm supposed to hang out with penny.. well, she's not really into that kind of stuff. yeah, okay. well, if you want to hear about the lecture, i can tell you all about it at work, or, you know, over dinner sometime. what? jenga, i win! ♪ our whole universe was in a hot, dense state ♪ ♪ then nearly 14 billion years ago expansion started... wait! ♪ ♪ the earth began to cool ♪ the autotrophs began to drool, neanderthals developed tools ♪ ♪ we built the wall ♪ we built the pyramids ♪ ♪ math, science, history, unraveling the mystery ♪ ♪ that all started with a big bang ♪ ♪ bang! ♪ captioned by media access group at wgbh access.wgbh.org