How does it work?

The smells are recognized because each smell molecule fits into a receptor cell like a puzzle piece, or so says one theory. The cells then send signals to the brain via the olfactory nerve. The brain interprets these electrical signals as the bouquet of roses, or the rotting fish that you've held up to your nose.

The part of the brain that receives these messages is called the olfactory bulb, part of the cortex of the brain. It can then relay messages on to many different parts of the brain.

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