Bang Goes the Theory

Braking Systems & Origins Of Speech (1x7)

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Jem Stansfield tests out new braking systems that won't burn money, Liz Bonnin looks into the origins of speech by trying to wipe out someone's speech cortex, Dallas Campbell takes part in a sea race with Dame Ellen MacArthur to try and explain why British summers are rubbish and Dr Yan Wong explains a common optical illusion.