The human sense of smell is really complex! It’s not just your nose: it is actually a combination of your brain and your nose cells working together. It all starts with air. The air has a lot of smell molecules floating in it. When the air enters your nose, the different molecules activate special smell sensor cells in your nose and sends the information to the brain. The part of the brain that recieves the signals is called the Olfactory Cortex. The Olfactory Cortex decodes that information and tells you what you are smelling! There are so many smells in the world and each human has a different point-of-view with different smells. The human nose can detect so many smells because they have the molecule-sensing cells and a part of the brain to process that smell! All that comes together to help us smell!!