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of the hand's heel; one uses the open fist to knock with the middle knuckle of the middle finger.

Speakers of some English dialects may use the word "nieve" or "neef" to refer to a fist.

Physiology and neurology

Making a fist is virtually unknown among other primates. This is because while "most primate hands are long of palm and finger [and] short of thumb", the proportions are the opposite for humans.

At least one study has claimed that the clenching of one's fist can be used to recall information.

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