Why are some people left handed and some right handed

Arm and hand movements start in the brain, in an area called the motor cortex, which sends a signal to the spinal cord that's translated into a motion. The researchers found that while the fetus is growing in the womb, up until about 15 weeks, the motor cortex and the spinal cord are not yet connected, but right- or left-handedness has already been determined.

I am a bit late but here's the

For example, if you use the left side of the brain to speak, you will likely be right-handed and the opposite is also true. This relationship between brain function and handedness seems to be the reason why some people are left-handed, and some are right-handed.

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