Today I learned that people actually have a dominant nostril that switches back and forth several times a day. Every time you smell one nostril takes in a big, quick gulp and the other a longer, slower one. They each take turns doing this. The difference in the speed of the sniff allows for both chemicals with slow absorption and fast absorption to get catch up in your mucus and read by your brain. Two nostrils allow your nose to always know. Very clever.
You can read more about your sniffer here.
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