Horizon programme on what intelligence is and where it comes from. Large focus on role of genes and inherited intelligence. Latest thinking suggests that genes are only responsible for only 50% of our intelligence. An interesting test tracked people, those who at 4 could resist eating marshmallows, at 40 had been more succesful at school, healthier and had lower rates of divorce. This seems to highlight the role of nurture.
http://www.bbc.co.uk/i/x7cb3/
