Scientists Test What the Nose Knows
Scientists once estimated that humans could distinguish only 10,000 unique smells, as compared to 7.5 million colors and 340,000 tones. Now a new Rockefeller University study suggests the nose knows much more than we thought. Instead of 10,000 unique odors, try one trillion.
Andreas Keller is a research associate at The Rockefeller University in New York, New York.