A few hundred million years after the big bang, the first stars formed.  We aren’t exactly sure how, but we do know that they contained Hydrogen, Helium, and a little bit of Lithium.  These were the only elements in the entire universe at the time.  Within these first stars, the fusion of heavier elements began.  Oxygen, Nitrogen, Carbon, Iron, and all the other elements that make up everything we know formed Billions of years ago in these first stars and in their progenitors.  It was a slow process to produce these elements and seed them throughout the cosmos, but over...