SANDY SPRINGS, Ga. - Laughter really is good medicine, at least when it comes to helping older adults get healthier.

At Delmar Gardens, a senior living community in Smyrna, Georgia, Celeste Greene works the room, waving her arms in the air, trying to give people the giggles.

They call this simulated laughter.

"We're laughing on purpose,” Greene says. “What I like to say is we're laughing on purpose because it feels good and it's good for us."