Right-handers, but not left-handers, are biased to select their dominant hand

Right-handers, but not left-handers, are biased to select their dominant hand
The vast majority of humans -- over 90% -- prefer to use their right hand for most skilled tasks. For decades, researchers have been trying to understand why this asymmetry exists. Why, with our two cerebral hemispheres and motor cortices, are we not equally skilled with both hands?