Episode 1 | The Secret Life of Twins (1999)
Prof Robert Winston examines science of identical twins to reveal human genetics and behaviour. Looks at risky start to life experienced by twin siblings and celebrates aspects of being a twin.
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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