The evolution of humankind

An opposing digit, the use of tools

Inventing the wheel, exploring space

Brain size still developing

Two men and a referee

Foam gloves and a silver cup

Devolution about to begin

Round one, ding, ding!

A perfect right to the other's chin

No tools, wheels, or exploration

Brain size still developing

The evolution of humankind

The evolution of humankind

The evolution of humankind

The evolution of humankind