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The weekend-long science extravaganza returns. Big name speakers this year include Alice Roberts, Jim Al-Khalili and Strictly star Hamza Yassin. Elsewhere you can get up close with a Formula E Gen3 racing car, see Luke Jerram’s massive illuminated Mars sculpture, visit a hospital of the future, spot stars in a pop-up planetarium, ride VR rollercoasters and chat to leading researchers about how they're shaping the world today.