Pinocchio had it rough -- a telescoping nose is hard to hide. But human liars give off telltale signs, too.
- Watch the eyes. A liar's eyes may dart, dilate, rise, or refuse to make contact.
- Throat clearing, foot tapping, and raised shoulders are also cause for suspicion.
- Large people often pull in the chest and shoulder areas when they're lying.
- Whatever the revealing gesture, people tend to do it at the very moment they are fibbing. Watch what a person does when you know she's telling the truth to identify unusual behavior when she's not.