In John Updike's memorable description, "The earth is just a silly ball/To them, through which they simply pass."

You'd never know it. but 6 trillion subatomic particles pass through every square inch of your body every second at nearly the speed of light. Most are leftovers from the big bang, but others arrive fresh from their superhigh-energy origins near black holes, deep inside gammaray bursts and supernovas, and within the core ot our Sun. They zip across space, pass through your flesh and bones as though you didn't exist, and continue heedlessly on their way.

Before these particles were ...

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