Matthew go to www.mensa.org it will give you all the info you need.

Basically to join you have to have taken an IQ test and finished in the 98th percentile. I joke about it because I have been a member since I was 16. It's fun and social but really nerdy. Honestly it is great for networking and most people are very nice, however I don’t think intelligence is based on an IQ, a lot of people are smart but common sense is much harder to come by.