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Twenty years ago Bart Weetjens combined a life-long passion for rodents with a desire to help African countries blighted by discarded weapons of war. His charity has used specially trained rats to clear over forty eight thousand landmines and other unexploded ordnance in five countries around the world. Now they've come up with another novel use for the rats' skills - this time in diagnosing tuberculosis. (Picture: Bart Weetjens with Chavez, one of his trained rats Picture credit: APOPO)