I live with one, and work with at least two others.
I’m talking left-handed people. The most recent episode of Quirks and Quarks, CBC Radio’s weekly science program, has a lengthy and interesting segment on what causes left-handedness (MP3, 20 min) (hint: still not quite known), and typical traits of left-handers. If you’ve got a left-handed person in your life, it’s worth listening to! (And considering subscribing to the Q&Q podcast!)