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-earth
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