There is no question that body language is important. And, according to Leil Lowndes in her book How To Talk To Anyone, you can capture — and hold — anyone's attention without even saying a word. Here's how:
The Flooding Smile
"Don't flash an immediate smile when you greet someone," says Lowndes. If you do, it appears as if anyone in your line of sight would receive that same smile. Instead, pause and look at the other person's face for a second, and then let a "big, warm, responsive smile flood over your face and overflow into your eyes". Even though the delay is less than a second, it will convince people your smile is personalised for them.