Humans can produce thousands of distinct ... which lifts the corners of the mouth. But a Duchenne smile is characterised by the additional contraction of the orbicularis oculi, crumpling the ...

Scientists have successfully grown a human tooth in the lab for the first time, opening new doors for natural regeneration.

But the researchers have found bottlenose dolphins (Tursiops truncates) have an “open mouth” expression that they use to communicate with each other during play, much like a smile in humans.

PISA, Italy — You can tell a lot from a smile. For humans, it’s a symbol of joy. For bottlenose dolphins (Tursiops truncates) ...