smile..... :)

A smile is a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement....
A smile is a happy face expression using mouth, but without producing voice...

It takes 37 muscles to frown and 22 muscles to smile. So smile.... it conserves energy.

ORIGIN: Some sayings have been with us so long that their origins are now wholly forgotten. This popular aphorism about a greater number of facial muscles being needed to produce a frown than are required to generate a smile is one such snippet of homespun wisdom; it has been a part of our cultural landscape for so long that no one now knows where it began.

One deep-fried-Zen adage advises: "It takes 13 muscles to smile and 33 to frown. Why overwork?" (The Washington Post, 5 December 1982)

"You know the old adage that it only takes 10 muscles to smile but it takes 100 to frown," she said. (The New York Times, 19 April 1987)

According to doctors we use only four muscles to smile, but when we frown we use 64 muscles - 16 times more. (The Hindu, 11 March 2000)

It takes four muscles to smile, 20 to frown and roughly 317 to appear amused when a Celine Dion imitator, who happens to be a man, sings a song about, er, flatulence.
(The Denver Post, 29 September 1998)

It's easier to smile than to frown. A smile uses 17 muscles, a frown, 43.
(Milwaukee Journal Sentinel, 24 February 1997)

Right there, you commit to selling to all employees - at cost, not a nickel of markup - company T-shirts that say, "It only takes one muscle to smile and 37 muscles to frown."
(St. Louis Post-Dispatch, 24 April 1995)

Don't they know it is said you use 35 muscles to frown and four to smile? Why tire yourself? ([Queensland] Sunday Mail, 18 August 1991)

Sonny Smith, Auburn's basketball coach, on his dour counterpart at the University of Alabama: ''It takes 15 muscles to smile and 65 muscles to frown. This leads me to believe Wimp Sanderson is suffering from muscle fatigue.'' (The New York Times, 16 December 1986)

It takes 72 muscles to frown - only 14 to smile!" (Encyclopedia of 7700 Illustrations, 1979)