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Scientists wondered why only humans are
right-handed. Monkeys and apes use
hands equally. The researchers compared human
and brain patterns with monkeys and apes. The
showed that humans have longer legs compared to their arm
. Another reason is the left
of the brain controls the right hand. It is responsible for
. A researcher said: "By looking across many primate
, we can begin to understand which aspects of handedness are
and shared, and which are uniquely
."
