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For about a century, scientists thought that human noses were able to recognize 10,000 different odours. Although this has been true for a number of years, new research shows that we can actually detect over 1,000,000,000,000 distinct scents. That is over a trillion different smells. Leslie Vosshall and colleagues, who work at Howard Hughes Medical Institute, says that the 10,000 number had to be wrong. They considered that the human eye perceives 10 million different colours using only 3 types of light receptors, and the human nose has 400 different receptor types in comparison. Vosshall and her team created an experiment to prove this new theory, but because testing a trillion different scents would take eternity, the team crafted never-before-smelled scents composed of 10-30 odour ingredients. Each volunteer in the experiment smelled 264 different groupings of odours and then the team used that data to determine how many different scents the average human could identify. This is very cool new information that I have learned because it shows us that we are capable of so much more than we expect ourselves to be capable of. Considering that the whole existence of the human race could be wiped out by one single infection, this information reminds me that humans are too awesome to go into extinction.