Hacker News
- The Science Of Smiles, Real And Fake https://www.npr.org/sections/health-shots/2019/07/01/735822187/the-science-of-smiles-real-and-fake 3 comments
- Spot the real and fake smiles [test] http://www.bbc.co.uk/science/humanbody/mind/surveys/smiles/index.shtml 7 comments science
- "Just smile, you'll feel better!" Will you? Really?" - Fake smiles, real happiness!! http://scienceblogs.com/cognitivedaily/2007/11/just_smile_youll_feel_better_w.php 3 comments reddit.com