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                   Study: Humans Can Detect 1 Trillion Smells

   Humans have long been thought to have a relatively weak sense of smell.
   But a team of U.S. scientists has put that theory to rest.
   Researchers from Rockefeller University in New York have determined
   that humans can detect 1 trillion smells.
   They carried out their research by taking 128 different odor molecules
   and had volunteers sniff mixtures using 10, 20 or 30 of the odors.
   Until now, most scientists believed the human sense of smell was
   limited to 10,000 odors.
   The researchers say their findings could shed light on how the brain
   processes information.
   The study appears in the journal Science.
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   [1]http://www.voanews.com/content/study-humans-can-detect-1-trillion-sm
   ells/1875925.html

References

   1. http://www.voanews.com/content/study-humans-can-detect-1-trillion-smells/1875925.html