Power Of A Smile

"Mona Lisa's coy smirk worth isn't the only smile worth a fortune.
A megawatt grin from a loved one can produce the same brain waves as
learning you won $40,000, according to researchers. What's even more
valuable? The longer life you may enjoy from wearing your own happy
face. One study found that those who smiled the most lived an extra
7 years, on average. So flex those facial muscles every chance you get."

-Prevention Magazine, September 2011