"If one stretches out the DNA contained in the nucleus of a human cell, one obtains a two-yard-long thread that is only ten atoms wide. This thread is a billion times longer than its own width. Relatively speaking, it is as if your little finger stretched from Paris to Los Angeles."

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Every atom you possess has almost certainly passed through several stars and been part of millions of organisms on its way to becoming you. We are each so atomically numberous and so vigorously recycled at death that a significant number of our atoms-up to a billion for each of us, it has been suggested-probably once belonged to Shakespeare. A billion more each came from Buddha and Genghis Khan and Beethoven, and any other historical figure you care to name.

— Bill Bryson