Mensa was founded in England in 1946 by Roland Berrill, a barrister, and Dr. Lance Ware, a scientist and lawyer. They had the idea of forming a society for bright people, the only qualification for membership of which was a high IQ. The original aims were, as they are today, to create a society that is non-political and free from all racial or religious distinctions. The society welcomes people from every walk of life whose IQ is in the top 2% of the population, with the objective of enjoying each other's company and participating in a wide range of social and cultural activities
http://www.mensa.org/info.html
SUPER SMART folks. :)
You can also buy Mensa quiz books at the large retail book stores. They are utterly fascinating. Also, you must be tested to join.