Interesting
Psychologists have studied smiles carefully for decades, but mostly from the outside. When the zygomaticus major muscles in our cheeks contract, they draw up the corners of our mouths. But there’s much more to a smile than that.
Interesting
Psychologists have studied smiles carefully for decades, but mostly from the outside. When the zygomaticus major muscles in our cheeks contract, they draw up the corners of our mouths. But there’s much more to a smile than that.