Editor’s Note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. For humans, flashing a smile is an easy ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Dolphins are among the most playful and social animals on Earth, yet ...

The other day, my daughter complained that her 89.5 average in history class left her short of an A for the grading period. As a teacher mom, I couldn’t help but probe further. I asked her to describe ...

A recent study out of Italy found that dolphins smile at each other while playing. The smile, which is actually more of an open-mouthed expression, was observed almost exclusively when dolphins were ...

Dolphins living in captivity often make an open-mouth facial expression while playing with each other. Zoomarine, Italy Bottlenose dolphins “smile” at each other while playing, making open-mouth ...

A group of Indo-Pacific bottlenose dolphins in Shark Bay, Western Australia. (Madison Miketa/Shark Bay Dolphin Project/National Science Foundation) (CN) — As one of the most intelligent animals in the ...

Dolphins are extremely playful, but little is known about how they -- and other marine mammals -- communicate during playtime. New research shows that bottlenose dolphins (Tursiops truncates) use the ...

Dolphins are extremely playful, but little is known about how they—and other marine mammals—communicate during playtime. New research publishing October 2 in the Cell Press journal iScience shows that ...