It’s one of biology’s biggest questions: is it nature or nurture that makes us who we are? Now, thanks to twin studies, scientists like Dr Nancy Segal may just have some answers.

By studying identical twins separated at birth scientists can gain unique insight into just how much our genes influence our behaviour, personality and traits.

To hear from twins who were separated as part of a controversial study, see our follow up here: https://www.youtube.com/watch?v=2a5U-yr4ESY&t=308s

Produced by Melissa Hogenboom
Animation by Stefania Sottile
Edit by Pomona Pictures

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