(https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-prn1/558024_356402357743353_113683338681924_1053336_2086059759_n.jpg)
It takes seventeen muscles to smile and forty-three to frown. So, smile! ;)
Just to add to it. People who frown always, go older than their age. So, smile :)