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Why Thinking Makes You Tired #didyouknow #sciencefacts #humanbrain #biologyfacts #mindblowingfacts #factsdaily #learnontiktok #weirdscience #healthfacts

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Created December 27, 2025

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Your brain uses about 20 percent of your body’s energy, even though it only makes up about 2

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percent of your weight. That’s why thinking hard can actually make you feel tired.

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