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It's the 2019 Christmas special and Jo reunited her guests from her on stage event at the Cheltenham Science Festival to talk about the ‘science of Christmas’, plus favourite festive film and food.

She’s joined by TV presenter & writer Dallas Campbell, Gloucester based cyber security expert Dr Jess Barker, professor of microbiology Jo Verran and science communicator & chemist Dr Jamie Gallagher.

Topics discussed include setting fire to Christmas puddings, snowflakes and space!