Facial expression control starts in a very old part of the nervous system. In the brain stem sits the facial nucleus, which ...
When a baby smiles at you, it's almost impossible not to smile back. This spontaneous reaction to a facial expression is part ...
Photo-Illustration by Chloe Dowling for TIME (Source Images: Klaus Vedfelt—Getty Images, Tim Robberts—Getty Images, Kelvin Murray—Getty Images, Robert Recker—Getty Images, Howard Kingsnorth—Getty ...
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