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Hair has always held us captive: a symbol of vitality, or of sexual attraction and youth. But what are its molecular secrets? And what are we learning about those other mysterious filaments: the hair-like cilia attached to almost every living cell? Bridget Kendall asks leading hair loss researcher Ralf Paus, medical geneticist Philip Beales, and artist Adeline de Monseignat whose sculptures of fur and hair look both dead and alive. Photo: Hair on scalp (coloured scanning electron micrograph) Credit: Science Photo Library