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Now you’ve honed up the mind, try it out on the array of evidence in Jenny Randles’s UFO Retrievals (Blandford, £8.99 pbk, ISBN 0 71372 493 5). She’s provided a rich grab-bag of documents, stories, beliefs and a refreshingly clear line between what is known, not known and what is clung to blindly. The book is walking off the shelves: reprinted on publication day as early copies had sold out.