One Answer

  1. You mean walnuts, of course. The answer is simple: because both in the case of the brain and in the case of the nut, nature needed to fit a large amount of biological material into a limited volume. The nut grows from the inside out, and the functionality of the brain depends on the size of the cortex. Beyond the skull and shell, the brain and nut can not go out, so they have to fold, forming convolutions.

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