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Distinguished Technician & SOTW Columnist. RIP, Yo
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(Reacting to Quote Originally Posted by lostcircuits : "There are essentially 4 olfactory receptors that are supposed to encode smells")....

This is absolutely false, humans have hundreds of different olfactory receptors; orders of magnitude more distinct receptor types than we have for any other sense.
I guess that quote was confusedly referring to the sensations on the tongue - sweet, sour, bitter, salt, but even then, omitted Umami.
 
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