humans
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TIL humans can learn to observe their surroundings with echolocation. By snapping or clicking the tongue, humans can bounce sound waves off of nearby objects. The resulting echo reveals the approximate size and distance of the obstacle. Anyone with normal hearing can learn this skill.
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whatilearned
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TIL Humans are a tropical species. Human evolution has produced bodies that were meant to live in hot and humid conditions. Our species is in its infancy as far as cold weather evolution is concerned, and physiologically speaking, our bodies are not supposed to be able to survive there.
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whatilearned
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