Robert Llewellyn joins Simon to judge suggestions for the next humans from chemist Kathryn Harkup, evolutionary biologist Ben Garrod, the studio audience at the Cheltenham Science Festival and the amazing lyre bird. Our theme music was written and performed by Laurence Owen. Graphics by Theo Weedon, web design by Ian Bridgeman and support from the Wellcome Trust. The producer is Rachel Wheeley.
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