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The TSA's job is to make public travel safe. The dogs help find an enemy through its artillery and make sure an area is safe for troops to pass. Customs and Border Protection (CBP) also depends on bomb-sniffing dogs. Despite these two advantages for dogs, whose nose is more sensitive -- meaning, who can smell an odor with fewer molecules of it in the air -- depends on the chemical being smelled. First, Brandy sniffed. Her sniff reshaped her nose so that air, including odors from the bomb, hit her odor receptors. Many former wrestlers, including Jesse Ventura, have admitted to using steroids in the past. The signal traveled from her nose to her somatosensory cortex, an area of the canine (and human) brain that processes sensations, including smells. With training, we can pay attention and discriminate smells as well as dogs can -- wine tasters and perfumers are evidence of that. However, Myers, in informal experiments, found that humans can smell acetone at lesser concentrations than dogs can. Although humans smell using most of the same equipment as dogs, differences exist. All of this leads to an answer scientists often give: "Dogs almost certainly are better than humans at smelling for explosives, but as a scientist, I can't state that," says Myers.
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