Media Summary: Many species show off their teeth as a threat, so where Ron Gutman reviews a raft of studies about
Many species show off their teeth as a threat, so where Ron Gutman reviews a raft of studies about
Being happy
Can smiling
Joy and happiness
WBZ-TV's Dr. Mallika Marshall reports.
Many species show off their teeth as a threat, so where
NOTE FROM TED: While some viewers
http://www.ted.com Ron Gutman reviews a raft of studies about
Do
View full lesson: http://ed.ted.com/lessons/the-hidden-power-of-
Smiling