How do you know where a smell is coming from?

The brain determines the source of a smell through a combination of olfactory receptors and spatial awareness. When odor molecules bind to specific receptors in the nasal cavity, signals are sent to the olfactory bulb and then to other brain regions, helping to identify the scent's characteristics. Additionally, the brain uses contextual clues, such as the environment and past experiences, to pinpoint the source. This process allows us to navigate and respond to our surroundings effectively.