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========== Sheep... weren't always this fluffy.We fluffy-fied them by breeding the fluffiest in each generation.This is domestication: sculpting wild animals for better human use.As we saw in Part 1, for early man, animals were powerful tools...food, clothing, transportation, tractors.Yet, though there were animals everywhere, only a handful were domesticated in the pre-modern world.What made these different?Let's make a domestication checklist, shall we?First up: FeedableA cow is a machine that turns grass into steaksAnd a tiger a machine that turns steaks into… tiger.Ten pounds of grass make a pound of steak. And ten pounds of steak make a pound of tiger.... but these have the same number of calories -- so you might as well just eat the cow and save your...