A posed smile boosted happiness by about as much as looking at pictures of puppies and rainbows.
Scientists reckon they've produced the best evidence yet that a fake smile can lift your mood.
A 1988 study found that people thought cartoons were funnier when they held a pen or pencil in their teeth without letting their lips touch it - which activated the same muscles as a smile - but these results weren't replicated when the study was repeated in 2016.
But new research at Stanford University in California, has found a posed smile boosted happiness by about as much as looking at pictures of puppies and rainbows.
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