Pilots kept their manuals in such briefcases back then. Brandy then interpreted the smell; she decided she'd smelled an explosive. Inside, police found enough of the explosive C-4 to destroy the plane. C-4's signature includes which odors are in it, their ratios and, possibly, whether C-4 tickled a nerve in her nose called the trigeminal. Because Brandy smelled C-4 many times, she remembered its signature, and she knew to sit when she smelled it. She did that by the bomb's odor signature, says Lawrence Myers, an associate professor of anatomy, physiology and pharmacology at Auburn University's College of Veterinary Medicine. Dogs also have more odor receptors in their noses than we do -- 20 to 40 times more, according to Myers. 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.
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