13% of the world's population is left-handed according to lefthandersday.com

The website brainjet.com says southpaws are smarter than right handed people:

St. Lawrence University conducted IQ tests among right and left handed people. The tests results concluded that there were more left handed people with IQs over 140 than those individuals with dominant right hands. To prove it, Albert Einstein, Charles Darwin, Benjamin Franklin, and Isaac Newton were lefties!

Here are several other A-List lefties:

 

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