Mensa

"Well you know we have we have a chapter on Atlantis..."

- Rodney Mckay

Mensa is the largest, oldest, and most famous high-IQ society on the planet Earth. It is a non-profit organization open to people who score at the 98th percentile or higher on a standardized, supervised intelligence test.

John Sheppard took the Mensa test and passed but did not join. However, Rodney Mckay did join and is now a member of the Mensa chapter on Atlantis.

Alternate reality
''In an Alternate reality, John Sheppard is an active member of Atlantis' Mensa chapter and something of a know-it-all. ''