What are odors?

Odors are like invisible messages that our nose can read.

When you smell something sweet, like a cookie, or sharp, like a lemon, it's because tiny pieces of that thing have traveled through the air and landed on your nose. These tiny pieces are called molecules, and they're so small that you can't see them, but you can definitely feel them!

Your nose has special helpers inside it called smell cells. When those tiny molecules touch these cells, the cells send a message to your brain. Your brain then says, "Oh, I know what this is!" and you recognize the smell, like when you walk into a bakery and think, "I can almost taste that cinnamon!"

Every object has its own kind of molecules. A flower has different ones than a pizza. When those molecules mix in the air, your nose reads them all together to tell you what’s around, like a detective solving a mystery using smell instead of clues!