Let's be honest: what don't we get upset about day in, day out? The parking ticket on the windshield, the slow cashier at the supermarket checkout, traffic jams, delayed trains, and, of course, the weather. But every annoyance leaves its mark. When we are angry, the glabellar fold between our eyebrows digs deep into our skin. It's not called the frown line for nothing. It would make much more sense to be more relaxed and optimistic and simply laugh more. Laughter not only puts us in a more posit...