Episode 1 | The Secret Life of Twins (2009)
Investigating the world of identical twins, this programme looks at what science can learn from the uncanny similarities between twins.
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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.
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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