“Carl Sagan said that if you want to make an apple pie from scratch, you must first invent the universe. When he says ‘from scratch’, he means from nothing. He means from a time before the world even existed. If you want to make an apple pie from nothing at all, you have to start with the Big Bang and expanding universes, neutrons, ions, atoms, black holes, suns, moons, ocean tides, the Milky Way, Earth, evolution, dinosaurs, extinction-level events, playtupuses, Homo erectus, Cro-Magnon man, etc. You have to start at the beginning.”

~from The Sun Is Also a Star by Nicola Yoon