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4.0

Such a beautiful (and until recently invisible) idea, the importance and unavoidable nature of atoms, one that seems to put everyone and everything on a satisfyingly level playing field. Your good and bad decisions, your wingspan, your wholeness as a person—these are all possible because of your own 7 billion billion billion atoms, each one made up of (roughly speaking) a positive nucleus in the middle, and the negative electron cloud surrounding it—a cloud that sort of dances from side to side, alternately enchanting other atoms and pushing them away (the really complicated magic can be left to quantum mechanics). Without atoms, nothing would be here; not the book in your hands, not the pen that leaked into your pocket this morning, not those buildings that are enough to make you scared of heights, nothing. If it weren't for atoms, there wouldn't be mass, or molecules, or matter, or me, or you.