Parental attachment revolutionized the biology of the brain. It became possible for mammals to be born without survival skills and to learn from life experience instead. Unlike reptiles, fish, and plants, which are born with all necessary survival knowledge, mammals are born fragile and stupid. The mammal brain does not fully develop in the safety of the uterus or egg. It develops by interacting with the world around it. A mammal needs protection while its brain is still developing, but this investment leads to a huge advantage: Each generation wires itself to survive in the world it actually
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