Barack Obama had a famous left-handed signature. Chip Somodevilla/Getty Images In graduate school, I earned beer money by modeling for life drawing classes in various art departments. (Don't judge ...

They are all golly-handed, gibble-fisted, port-sides, southpaws—that is to say, they are all left-handed. Approximately 10 percent of the entire human population is left-handed, and though for a ...