The domesticated chicken is probably the most widespread bird in the annals of planet Earth. If you measure success in terms of numbers, chickens, cows and pigs are the most successful animals ever.
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In order to survive in a very small tribe, you needed to know how to do lots of things for yourself: how to make your tools, how to get food, and how to make your clothes - things most of us today don't need to know. The only thing I need to survive is to know history.
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For thousands of years, humans believed that authority came from the gods. Then, during the modern era, humanism gradually shifted authority from deities to people.
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Humans have an amazing capacity to believe in contradictory things. For example, to believe in an omnipotent and benevolent God but somehow excuse Him from all the suffering in the world. Or our ability to believe from the standpoint of law that humans are equal and have free will and from biology that humans are just organic machines.
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People have long feared that mechanization might cause mass unemployment. This never happened because, as old professions became obsolete, new professions evolved, and there was always something humans could do better than machines. Yet this is not a law of nature, and nothing guarantees it will continue to be like that in the future.
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The widespread assumption is that somehow, the brain produces the mind; somehow millions of neurons fire signals at one another create or produce consciousness... but we have no idea how or why this happens. I'm afraid that in many cases, people in the tech world fail to understand that.
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Humans have two kinds of abilities: physical and cognitive.
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We can suspend disbelief about Harry Potter, and we do the same thing with God, and we do the same thing with human rights, and we do the same thing with money.
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There is no limit to how much health you can provide people.