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Smiling is pretty universal too. Everyone smiles.
Perhaps this can be linked to our ancestors. Anthropologically, each of these may be a certain signal. For example, showing teeth while smiling may indicate a sense of "everythings good".
It's instinct. We've got 4 billion+ years of memory to draw upon, and things like these are ingrained.
__________________
the light that burns twice as bright
burns half as long
and you have burned so very, very brightly
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