If you're happy, smile. If you're bummed, don't hide it.
Researchers at the University of Denver found that people whose expressions match their emotions feel more socially connected and are less likely to be depressed.
Read more about the study here.
For help on today's challenge, discover our three ways to be happy.
Tell us if you're up for this Challenge of the Day after the jump.
Tomorrow's Challenge: In the Company of Trees
Yesterday's Challenge: Fix Yourself a Plate
