When a smell enters your nose, a message is sent to your brain. Your brain will then know if the smell is good or bad, or if you have smelled it before.
Hey, smel l this. , l l i . He el l this.
IT SMELLS HORRIBLE!
LATER...
I 'm not fal l ing for that again!
Hey, smel l this.
Your brain is especially good at remembering smells.
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