Stone age humans took two million years to develop brain power
London, Nov 4 Stone age humans took nearly two million years to develop the brain power to make sophisticated tools like hand-held stone axes, a new study has claimed.
Cavemen made tools 71,000 years ago Updated: 07:08, Thursday November 8, 2012 Paleontologists say they have found small blades in a South African cave proving that man was an advanced thinker making stone tools 71,000 years ago - millennia earlier than thought.