Episode 2 | The Secret Life of Twins (2009)
How the differences between identical twins can help science understand what makes us all who we are, including the possible genetic basis of sexuality.Tweet
Little Hans | Mind Changers
A phobia of horses developed by a boy living in Vienna in 1904 seemed unlikely evidence for the Oedipus complex. But for Sigmund Freud, this was the proof he had been waiting for.
Genetic basis of intelligence | Discovery
Professor Robert Plomin explains the twin study method and how it is used to explore the genetic basis of intelligence