Ask the doctor: 10% brain myth

Q. Is it true that we use only 10% of our brains?

A. Many parts of the body have some extra capacity built in. You can have an entire lung or kidney removed and get along fine with the one that remains. There's skin, small and large intestine, and bone marrow to spare. If the appendix, thymus, and spleen need to go, so be it. We can do without them if necessary.

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