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Curiosity has always been with us but it's not always easy to say what is the optimum amount in any given situation. Have the cosmologists lost sight of it in a dogmatic theory of the universe? Are there lessons in the scientific spirit of the 17th century? And when it comes to human beings and curiosity, does curiosity carry dangers for young people in changing societies? Joining Carrie Gracie are theoretical physicist Lee Smolin, science historian Philip Ball and social scientist Masooda Bano. (Image: Young girl peering into a 3D object. Credit: Al Barry/Three Lions/Getty Images)
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