Test your ability to distinguish genuine smiles from fake ones at BBC Science. You’ll get your results when you’ve finished, plus a discussion of why most people do a bad job at spotting fake smiles.
To put your ability to read faces to a different challenge, check out “Let’s face it: test your understanding of facial expressions” from the Mediation Channel vaults.
You can also test the sex of your brain, or amuse yourself with a full array of other online psychological tests and surveys.
(Hat tip to Cognitive Daily.)