Origin of Intelligence, Mental Illness Linked to Ancient Genetic Accident, University of Edinburgh Study  
12/12/2012 7:25:17 AM

Scientists have discovered for the first time how humans – and other mammals – have evolved to have intelligence. Researchers have identified the moment in history when the genes that enabled us to think and reason evolved. This point 500 million years ago provided our ability to learn complex skills, analyse situations and have flexibility in the way in which we think.