August 13 is International Left-Handers Day. Statistically 10% of the population are left handed. Notable lefties are Julia Roberts, Barak Obama, Leodardo da Vinci, and Prince William, not to mention Jack the Ripper and Osama bin-Laden.
All frivolity aside, left-handed people are more likely to develop schizophrenia, perhaps due to the fact that almost all machines, tools, and everyday utensils are made for right-handed people.
Handedness refers to unequal level of fine motor skills between the right and left hands. 70-90% of the population is right-handed. Mixed handedness is the term for people who do different tasks better with different hands. I have a friend who writes with her right hand, but eats with her left.
Ambisinistrous are those who are equally awkward with both hands. The word itself exhibits a prejudice against left-handedness, literally meaning two left hands.