This article is from the Mensa FAQ, by Phil Hill phil@miracle.com with numerous contributions by others.
Mensa is for those who rejoice in the exercise of the mind. If you
enjoy mental challenges and revel in the interplay of ideas, Mensa is an
organization that will stretch your mind and expand your horizons.
Mensa is an international society that has one - and only one - unique
qualification for membership: you must score in the top 2% of the
population on a standardized IQ test.
 
Continue to: