Pain is the price we pay for mobility. Since the dawn of life creatures have segregated into two camps: motionless foodmakers and migrating food foragers. Creatures in the first camp learned to draw energy from their immediate environments. Plants turn chloroplasts to the sun and use photosynthesis to manufacture glucose, while deep-sea creatures harness heat arising from thermal vents on the ocean floor. Creatures in the second camp sprouted tails, legs, fins, and wings and set off to eat the food makers, or each other. Lacking a clever trick like photosynthesis, the food foragers came up
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