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This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?

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A bloodhound's sense of smell is far better than its owner's.

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But human olfaction is still nothing to sneeze at.

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Because your nose can detect at least a trillion individual scents.

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That's according to research in the journal Science.

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Researchers mixed together combinations of some of 128 different odors.

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Study subjects then smelled three samples: two of the combination scents that were the same and one that was different.

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Based on subjects' id's of the different smells, the researchers gauged how close the mixtures could be and still be distinguishable.

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Those findings let them determine how many different scents could exist made of combinations of the original 128 odors.

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The result was more than a trillion.

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Researcher Andreas Keller of the Rockefeller University told the journal Science's podcast why humans have such a discerning sense of smell:

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"Our olfactory system evolved…to discriminate very similar smells, like my baby from my neighbor's baby, milk that's still good from milk that turned bad.

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So those are very similar smells that only differ in a few components.

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So we evolved to be able to make those discriminations.

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And as a side effect of that we can discriminate all those other odors too."

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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