Human beings can recognize a smile from more than 300 feet away (almost the length of a soccer field). This is an evolutionary trait developed to identify friend from foe. But smiles are a tricky thing to decipher. They can be used to express, hide, or even disguise feelings.
from BrightSide RSS https://brightside.me/wonder-curiosities/9-types-of-smiles-and-what-they-mean-642010/
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