Every moment of the day we are surrounded by smells. Odors can bring back memories, or quickly warn us that food has gone bad. But how does our brain identify so many different odors? And how easily can we untangle the ingredients of a mixture of odors? Scientists have taken an important step toward answering these questions, and the secret lies inside the nose.

Source: Making sense of scents: 3D videos reveal how the nose detects odor combinations