Why Are Some People Left-handed?

People used to believe that being left- or right-handed had to do with the development of the brain in the womb.

People used to believe that being left- or right-handed had to do with the development of the brain in the womb. However, left- or right-handedness is decided when the foetus is 15 weeks old, at which time the brain’s motor cortex–which controls hand movement–is not connected to the spinal cor
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