What exactly are smells? I understand they are some kind of particle, but what actually makes them smell? Why do cookies smell sweet and skunks smell bad?
In: Biology
They are chemical compounds in the air. Those chemicals are detected by a bundle of nerves at the top of our sinuses called the [olfactory bulb](https://en.wikipedia.org/wiki/Olfactory_bulb). Those nerves sense the various chemicals and send signals to our brain, where it is perceived as smell and/or taste.
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