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Stink Moody's class goes on a field trip to the Science Museum to visit the "Oh, Gross!" exhibition, and Stink can't wait to see all the strange things. When he gets near a particularly smelly exhibit, he discovers that his own nose has amazing powers. He also learns about professional sniffers who even work for NASA! Will his trainers be super smelly enough to win the Golden Clothespin Cup? But it seems that his sense of smell will come in handy for something else entirely...