ELI5: Explain Like I'm 5

Sense of smell

Your nose is a special organ that helps you smell things! When you breathe in air through your nose, special cells in your nose called olfactory receptors detect tiny particles in the air that make up the scent of the thing you're smelling. These particles then send signals to your brain, which allows you to recognize and identify the smell. Sometimes, when something smells really strong, it can make you feel a certain way - happy, sad, or maybe even a little bit afraid. Just like how your eyes help you see things, your nose helps you smell things and understand more about the world around you!