We should all smile more often, in general. Just the simple act of smiling or laughing can make you happier.

But even better: smile at a stranger. Too often, we brush past strangers without a glance or a straight or scowling face. At best, we might give people a tolerant little smile to show that we are not mean. Usually, most of us try to avoid any eye contact at all.

Try this instead: look strangers in the eye and give them a genuine smile. In most cases, you’ll get a smile in return. The more you smile, the more laughs you’ll see in return.

Result? A happier world. So simple!