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    How to discover where Hannibal crossed the Alps
Chris Allen, microbiologist at Queens University Belfast, tells Adam Rutherford how he has worked out, from the remains of dung, where Hannibal and his elephants crossed the Alps two thousand years ago.
(Photo credit - Hannibal: The Man, The Myth, The Mystery © ÃÛÑ¿´«Ã½)
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