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This is Scientific American's 60-second science.'m Christopher in Taliatta. Got a minute?

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

Turned out, if the women liked the aroma of a particular shirt, the guy who'd worn it was likely to have genetically coated immunity that was unlike the woman's. Well, the effect isn't

just limited to sweaty shirts. Turns out we all smell things a little differently. You pick up a note of

cloves, say, where I smell something more soapy, and that too gives clues to our degree of genetic similarity.

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. And each

volunteer classified the sense differently enough that the researchers could single them out in

subsequent tests, based on what they called each subject's olfactory fingerprint.

Researchers then repeated that sniff test on another 130 subjects, 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. They found that people who perceive smells similarly

also had similar

HLA types. Study author Lavi Secundo, a neuroscientist at the Wiseman Institute of Science in Israel,

says the smell test could have real-world applications. For Oregon donation, you can think of this

method as a quick, and maybe quick and dirty method to sift between

the best and the rest.

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

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