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One fascinating thing about smell is that you can smell only on inhalations. On exhalations, the sensors shut down. Hard to figure out what the evolutionary ben
by ternaryoperator 6y ago
One fascinating thing about smell is that you can smell only on inhalations. On exhalations, the sensors shut down. Hard to figure out what the evolutionary benefit of that was. But so it is for humans, and I believe for most mammals.
- de_Selby 6y agoI suppose it makes sense, otherwise the smells from our breath and most recent meals digestion would mix with and confuse our sense of the smells surrounding us. I'm definitely glad we have this feature first thing in the morning before brushing my teeth!
- sojournerc 6y agoDogs noses have those slits in the side to move exhaled air out to the side without disturbing what's in front of the big nostrils. Fun to watch this work when my dog is ratting for voles in the yard.