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Human scent
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<blockquote data-quote="BSK" data-source="post: 5260896" data-attributes="member: 17"><p>The sense of smell of a species - rightly or wrongly - is judged by 1) the density of scent receptors per square inch in their nasal passages; and 2) the total square inches of scent receptor tissue in the nasal passages. By that metric, deer can smell better than any tracking dog. In fact, if they could be trained (and it appears they can't) they would be excellent tracking animals.</p><p></p><p>Another way of judging an animal's sense of smell is to expose them to very tiny amounts of a scent and then measuring the electrical activity in the sense of smell section of the animal's brain. For a smell like gasoline, humans must be exposed to 10,000 molecules of gasoline per billion molecules of air to produce an electrical response in our brain. A deer's brain will react to 1 molecule of gasoline per 1 billion molecules of air.</p></blockquote><p></p>
[QUOTE="BSK, post: 5260896, member: 17"] The sense of smell of a species - rightly or wrongly - is judged by 1) the density of scent receptors per square inch in their nasal passages; and 2) the total square inches of scent receptor tissue in the nasal passages. By that metric, deer can smell better than any tracking dog. In fact, if they could be trained (and it appears they can't) they would be excellent tracking animals. Another way of judging an animal's sense of smell is to expose them to very tiny amounts of a scent and then measuring the electrical activity in the sense of smell section of the animal's brain. For a smell like gasoline, humans must be exposed to 10,000 molecules of gasoline per billion molecules of air to produce an electrical response in our brain. A deer's brain will react to 1 molecule of gasoline per 1 billion molecules of air. [/QUOTE]
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