A new study demonstrates that your sense of smell is far more sensitive than you think and the world of scents is infinitely more varied. Scientists previously thought humans could smell around 10,000 different odors.
Human beings tend to think of themselves as visual first, auditory second, then touch and taste. Down at the bottom of the five senses is smell—at least when it comes to how often we’re aware of it. And while we all know how pungent a bad smell can be, and how memorable a good smell is, we probably don’t think our olfactory sense is all that sensitive, at least compared to the rest of our senses—or to the keen sense of smells exhibited in the animal world (Sharks can’t literally smell fear, but they can distinguish the smell of fisheven if they make up only one part for every 10 billion parts in the water).
While scientists estimate that human beings can discriminate between several million different colors and almost half a million different sounds, they have long assumed that we can distinguish perhaps 10,000 different odors. Most of the time humans are barely aware they’re smelling anything at all.