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The same mechanism is probably why studies show that forcing a smile even when you don't feel happy can lead you to slowly become happier.

https://www.scientificamerican.com/article/smile-it-could-ma...



This result has been cast into doubt by a recent replication attempt, which failed to find any such forced-smile effect.

https://www.psychologicalscience.org/pdf/StrackRRR_manuscrip...





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