Inside the extraordinary nose of a Search and Rescue dog

Rixi is what rescuers call a trailing dog, specially trained to pursue human scents over difficult terrain. Her nose, like most expert canines, can catch a scent from a mile away — five times farther than we can. These pooches can then follow this smell for hundreds of miles, which allows them to catch bad guys — or, hopefully, save disoriented hikers.

Yet the basic mechanics of these olfactory talents remain a mystery — a mystery that neuroscientist Lucia Jacobs is trying to solve.

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