"It is worth contemplating that the atoms in our body were not forged in the furnace of the Big Bang, but were created within collapsing stars. The temperatures and pressures within dying stars triggered the nuclear reactions that cooked the simple hydrogen and helium into more complex atoms. In the final explosion, as the nuclear fusion reached its climax, these atoms were thrown across the universe and eventually became the iron in our blood and the calcium in our bones. In other words, we are literally stardust. Or, for the less romantically inclined, we are merely nuclear waste."
~ Simon Singh