P/S/A: About half of our country's gifted students are never identified (USA), internet / Mensa IQ scores can be too low*, a lot of things are correlated with having a high IQ (for the tip of the iceberg: A 25% chance of being misdiagnosed by a psychologist (1) due, partly, to having super-sensitivities / over-excitability), so if you feel weird or crazy, have been diagnosed with a mental disorder or ADD/ADHD, or want to find out what other differences you have (perhaps in order to counter mind projection fallacy, which I've observed many unidentified gifted adults having problems with), check out Misdiagnosis and Dual Diagnosis of Gifted Children and Adults, especially since there's reason to suspect that the average LessWrong lurker/participant is gifted.

If anyone wants more info, you are invited to contact me. I've done a lot of research on gifted adults and am willing to share.

* About 1 in 6 gifted people have a learning disorder (1) and a ballpark 1 in 3 have creativity, both of which can significantly and unfairly reduce an IQ score provided by places like Mensa or online tests. A professional developmental psychologist is where you go if you want to take learning disorders and creativity into account when getting an IQ score.

Note: Do not confuse this for a 25% chance of misdiagnosis after walking into the psychologists office - it's a 25% chance for the entire gifted population.

1. Misdiagnosis and Dual Diagnosis of Gifted Children and Adults (It was given great reviews by two former presidents of the APA and various experts on gifted adults.)