Sure, a firm handshake makes a good impression. But to make a really good impression, do this: When you clasp the other person's hand, very gently touch your forefinger to his or her wrist. Aim for the spot on the underside of the wrist where you would take a pulse. Gently touching this very sensitive spot fosters a feeling of warmth and closeness. Your light contact might not even be consciously noticed by the other person—but he'll know he likes you! 

More on how to make a great first impression…

• How to Get a Yes From Anyone…Fast
• Dr. Taibi Kahler's Secret to Making a Great First Impression
• How to Get Anyone to Like You in Two Minutes or Less

They might not seem like much—but studies show that small physical gestures, such as high fives and fist bumps, pats on the hand and all sorts of little touches, result in surprisingly positive behavior changes. University of California-Berkeley researchers found that National Basketball Association teams whose players had lots of positive physical contact with one another played better than teams that did not. High fives do more than feel good—they encourage cooperation, ease stress, and create a warm and trusting collegial environment. So, go ahead, hug your family members often, give your children all the affectionate physical contact you can, and don’t hesitate to connect with nonfamily members by touching their hands or patting their backs. It’s powerful medicine.