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Dogs spend lots of time with their well-endowed nostrils stubbornly vacuuming the ground or pinned blissfully to the hind end of other dogs. They have about 25 times the area of nasal olfactory epithelium (which carry receptor cells) and have many thousands more cells in the large olfactory region of their brain (mean area of 7000 mm2) than humans (500 mm2). Dogs can differentiate dilutions of 1 part per billion, distinguish T-shirts worn by identical twins, follow odor trails, and are 10,000 times more sensitive than humans to certain odors. The hidden tales of yellow snow are quite revealing about the artistry of how dogs make sense of scents.









