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: The simplest atoms, like hydrogen and helium, were created in the first few minutes after the universe began.

: Your body is a temporary vessel for these particles. Every year, you replace about 98% of the atoms in your body with new ones from the food you eat and the air you breathe. The Evolution of Discovery : The simplest atoms, like hydrogen and helium,

: Heavier atoms, including the carbon in your DNA and the calcium in your bones, were forged deep inside ancient stars and scattered across space when those stars exploded as supernovas. The Evolution of Discovery : Heavier atoms, including

: If an atom were expanded to the size of a professional sports stadium, the nucleus (where almost all the mass lives) would be no larger than a marble sitting on the 50-yard line. : The simplest atoms