The hidden power of smiling

This TED-Talk will tell you why it's important to smile. Spoiler alert: It's good for you. 
It looks like smiling is key to a successful and healthy life. A study showed that pro basketball players that were photographed smiling on their collectable pictures lived much longer than their colleagues who didn't smile on their picture, interesting right? Also a smile is worth 2000 chocolate bars. Watch the talk to learn more!