About 90% of people are right-handed, while 10% are left-handed. "Some of the theories think it's because of the way our brains are wired," Dr. Nancy Segal said.

We've got the tea on the times you shouldn't use your left hand, and we're about to spill it—with the proper hand, of course. The left-handed dilemma Around 10% to 12% of the world’s ...

"Right, it's just a different look, because in baseball there are much, much fewer left-handed pitchers, so the ball is coming in on a different angle," he said.

The vast majority of people use one hand or the other for most things — and for nearly 90 percent of the human population, this is the right hand. Some 10 percent to 13 percent of humans are ...