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Astronomer Royal for Scotland Catherine Heymans talks telescopes, dark matter and comedy.
Professor Tim Coulson on how the wolves of Yellowstone National Park shape the ecosystem.
Claudia de Rham on defying gravity and understanding its fundamental nature.
Neil Lawrence on why we needn't fear the power of AI
Liz Morris discusses being in the first wave of UK women scientists to work in Antarctica.
Dr Anthony Fauci discusses his career spanning the worlds of medicine and politics.
Nobel Prize-winning astrophysicist Brian Schmidt talks supernovae studies and wine-making.
Jim Al-Khalili digs into the subterranean world of ancient bones with Jacqueline McKinley.
Surgeon Jonathan Shepherd on developing the Cardiff Model of Violence Prevention.
Doyne Farmer on how predict the future to help prevent climate change and win at roulette.