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Even people with good memories can have a hard time remembering the past accurately. That may be because the brain is constantly editing memories, updating them with current information. This may make good evolutionary sense. But it also means that some of your cherished memories may be wrong.
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Humans and other primates have really good vision. One scientist thinks that ability evolved in part to help monkeys and humans quickly recognize venomous snakes. When monkeys see photos of snakes, neurons in a specific part of the brain light up. The neurons respond to photos of the reptiles more than to monkey faces.