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段落1

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

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Two decades ago, Swiss researchers had women smell the tee shirts that various men had slept in for two nights.

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Turned out that if women liked the aroma of a particular shirt, the guy who’d worn it was likely to have genetically coded immunity that was unlike the woman’s.

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Well the effect isn't just limited to sweaty shirts.

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Turns out we all smell things a little differently,you pick up a note of cloves, say, where I smell something more soapy,

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and that too gives clues to our degree of genetic similarity.

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Researchers tried that test with 89 people having them sniff a couple dozen samples, and label each one using terms like lemony, coconut, fishy and floral.

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And each volunteer classified the scents differently enough that the researchers could single them out in subsequent tests, based on what they called each subject’s "olfactory fingerprint."

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Researchers then repeated that sniff test on another 130 subjects.

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But this time they did a blood test, too, to figure out each person's HLA type, an immune factor that determines whether you'll reject someone's organ, for example.

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They found that people who perceived smells similarly also had similar HLA types.

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Study author Lavi Secundo, a neuroscientist at the Weizmann Institute of Science in Israel, says the smell test could have real-world applications.

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"For organ donation you can think of this method as a quick, maybe a quick and dirty, method to sift between the best and the rest."

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He and his colleagues say it might even eliminate the need for 30 percent of the HLA tests done today.

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The work appears in the Proceedings of the National Academy of Sciences.

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Of course, there are additional applications.

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"The other thing we'd like to take it from here is kind of to build what you would like to call a social network based on the sense of smell.

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You would get a set of scratch and sniff cards, you can sniff them, derive your olfactory fingerprint,

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and then you can look up for people who are similar to you or dissimilar to you in olfactory perception."

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Factor in the 20-year-old tee-shirt study and olfactory fingerprints should also play a role in romantic preferences.

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Which means that some day a smell-based service could challenge eharmony.com for matchmaking supremacy.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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