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“Your cells are a country of ten thousand trillion citizens, each devoted in some intensively specific way to your overall well-being. There isn’t a thing they don’t do for you. They let you feel pleasure and form thoughts. They enable you to stand and stretch and caper. When you eat, they extract the nutrients, distribute the energy, and carry off the wastes - all those things you learned about in junior high school biology - but they also remember to make you hungry in the first place and reward you with a feeling of well-being afterward so that you won’t forget to eat again. They keep your hair growing, your ears waxed, your brain quietly purring. They manage every corner of your being. They will jump to your defence the instant you are threatened. They will unhesitatingly die for you - billions of them do so daily. And not once in all your years have you thanked even one of them.” — Bill Bryson