Looking someone directly in his eyes is a powerful tool for signaling your interest. In fact, studies show that we typically only make eye contact for a fraction of a second with people who fall outside our immediate circle, which just shows how intimate it is. It’s especially useful for connecting with someone who is at least a few feet away, say standing at a bar or across the room. Look in his eyes for one to three seconds. Then look away. Then look again and smile. With a little luck, he’ll be looking your way, too.