Happiness.

MSN had an article about the 5 secrets to happiness. Here they are, by Ed Diener, PhD, professor of psychology at the University of Illinois at Urbana-Champaign. He totes these boost our immunity and cut our risk of heart disease. Interestingly, regular sex raises your IgA by 30%.

1. Laughter- improves circulation.
   
2. Love- better cholesterol, fewer CV risks and better weight.
   
3. Determination- active coping skills have better NK cell function.
   
4. Expressiveness- Women who bottle up their feelings are four times more likely to pass away for any reason in a ten year period. Doesn't affect men the same way.
   
5. Pleasure- self-explanatory ;).