Did you know that the human nose can detect more than one trillion different scents? The olfactory system, which is responsible for our sense of smell, is made up of millions of receptors that can detect and distinguish a wide range of odor molecules. Research has shown that the ability to detect and discriminate between different scents is far more advanced than previously thought, and that the human nose is able to detect even very small differences in the chemical makeup of odor molecules. Additionally, the sense of smell is closely linked to memory and emotion, which is why certain scents can evoke strong memories or emotional responses.