NPR Krulwich Wonders

Let’s get dense. If we take all the atoms inside you, all roughly 70,000,000,000,000,000,000,000,000,000 of them, and squeeze away all the space inside, then,

http://www.npr.org/blogs/krulwich/2013/04/08/176565424/the-big-squeeze-can-cities-save-the-earthRead more...