We do it dozens of times a day without a second thought.
It is the ultimate universal language, a basic human reflex and a staple of everyday polite conversation.
But beneath the simple act of turning up the corners of your mouth lies a fascinating web of psychological triggers, biological hacks and social superpowers.
These nine studies reveal just how powerful a simple smile can be: from how it influences others to how we think and feel ourselves.
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Author: Dr Jeremy Dean
Psychologist, Jeremy Dean, PhD is the founder and author of PsyBlog. He holds a doctorate in psychology from University College London and two other advanced degrees in psychology. He has been writing about scientific research on PsyBlog since 2004. View all posts by Dr Jeremy Dean
