Except for hydrogen, all the atoms that make each of us up—the iron in our blood, the calcium in our bones, the carbon in our brains—were manufactured in red giant stars thousands of light-years away in space and billions of years ago in time. We are, as I like to say, starstuff.
Carl Sagan, The Demon-Haunted World: Science as a Candle in the Dark
sagan, science, starstuff, universe