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You don't use 10 percent of your brain. You use all of it.

Imaging shows activity across all brain regions, including during sleep. The brain is about 2 percent of body weight but burns roughly 20 percent of your energy – 90 percent idle tissue would be evolutionarily absurd. Even small damage to small regions causes clear deficits.

Useful: Anything promising to unlock your "unused 90 percent" is selling you a legend.

Source: en.wikipedia.org

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