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How Did the "Smile" Become a Friendly Gesture in Humans?
The Science of Smiling: The Anatomy and Function of a Smile
There are 19 types of smile but only six are for happiness - BBC
Smile - Wikipedia
10 Main Types of Smiles and What They Really Mean - Healthline
Why do we really smile? - Medical News Today
The Science of Smiling & Why It's So Powerful | Buffer Blog
What's behind that smile? - American Psychological Association …
The Psychological Study of Smiling – Association for Psychological ...
Why do we smile? - BBC Science Focus Magazine