We generally favor one side or the other, and use the hand on that side the most. Hand orientation is developed in fetuses, most commonly determined by observing which hand is predominantly held close to the mouth.
Is there any significance to the way we named these two sides? No doubt about it: our language sends the message that "right" is right. The majority not only rules, it rubs it in. Ninety percent of the adult population is right-handed, and the word for that side, "right," is derived from a variety of sources, all of which suggest strength (The correct side).Left, on the other hand, comes from the Old English, lyft, for useless, weak. The left side is often associated with awkwardness and clumsiness. If you're a klutz, you don't dance as if you had two left feet or getting out of the wrong side of the bed. On the plus side for lefty's, A 2006 study at Johns Hopkins University found that left-handed men are 15 percent richer than right-handed men for those who attended college, and 26 percent richer if they graduated.