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Compared to technology, the dog's nose still knows

German scientists are working to develop high-tech devices that might out-sniff dog noses. The goal is to detect minute traces of exhaled gases to locate live humans trapped in rubble. Despite the promise of technology, the combination of a dog's sniffing prowess, instincts and ability to process and make decisions based on wind speed and direction mean search-and-rescue animals aren't likely to be replaced soon.