It's commonly known that many animals are able to detect extraordinarily weak odors. The real mystery is how they can smell scents that are 1,000 times too weak to produce the chemical reactions necessary to make a scent signal.

 REF.: Vaughan, Christopher. 1990. Molecular odor‑eaters. Science News, v. 133. p. 348. Photo: Diagram of olfactory senses. (PD)

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