Submitted by nateblackmt t3_11a9tvk in askscience
GypsyV3nom t1_j9tsldx wrote
Reply to comment by Zchwns in Why is urine yellow? by nateblackmt
Taste and smell have some pretty insane under-the-hood processing that occurs in the brain. There are only about 400 different receptors in the human nose, but the different responses of those 400 receptors to odorants allows humans to detect over one trillion distinct scents. And that's just for humans, who have a relatively poor sense of smell compared to other mammals
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