"For centuries, left-handers have suffered unfair discrimination in a world designed for right-handers."
Santrock, John W. (2008). Motor, Sensory, and Perceptual Development.
"Most humans (say 70 percent to 95 percent) are right-handed, a minority (say 5 percent to 30 percent)
are left-handed, and an indeterminate number of people are probably best described as ambidextrous."
Scientific American. www.scientificamerican.com