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The Dog's Nose Knows Malaria

It doesn't take long for Freya, a Springer Spaniel with plenty of energy and a very sensitive nose, to find the sock of a child infected with malaria. Freya's ability to sense the deadly disease is tested in a plain white room. Her handler hides behind opaque one-way glass. At his signal, Freya darts across the lab room floor and sniffs a collection of small open mason jars. Each is holding a sock worn by a young child in Ghana for one night only. In less than 10 seconds, Freya...

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