weed

Why does pot make some people psychotic? Explanation here.

due to inbreeding

Hapsburg Lip is a thick, overdeveloped lower lip that often accompanies Hapsburg jaw.

The Genographic Project

San Bushman: Genetic evidence suggests they are one of the oldest, if not the oldest, peoples in the world — a "genetic Adam" according to Dr. Spencer Wells [born 1969], from which all humans can ultimately trace their genetic heritage. It was only about 50,000 years ago that humans first ventured out of Africa.