Our Inheritance from the Great Apes

Homo sapiens has achieved an ever-increasing hand skill in the vicinity of East Africa. The more those hands could do, the more successful their owners were, so the evolutionary pressure led to an increasing concentration of nerves and highly accurate muscles in thumb and fingers. The brain grew along with it. As a result, people can perform particularly complex tasks with their hands.

Homo sapiens also has its reproductive organs within reach. Halfway through the twentieth century, modern m...