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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .You've probably noticed that synthetic t-shirts stink more after a workout, compared to cotton.
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3 .But hey, it's not the fabric's fault.
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4 .It's the microbes that hang out on synthetics, that create that characteristic stench.
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5 .That's according to a study in the journal Applied and Environmental Microbiology.
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6 .Twenty-six volunteers half men, half women, worked out on spinning bikes for an hour.
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7 .And they did so outfitted with shirts of cotton, polyester, or a cotton/synthetic blend.
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8 .Then researchers stuffed the sweaty shirts into plastic bags.
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9 .The next day, a trained panel sniffed them, rating their funk.
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10 .Unlucky job. Because yes, the polyester shirts were indeed more musty, sour, and ammonia-like than the cotton.
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11 .DNA analysis revealed that Micrococcus bacteria were to blame.
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12 .They aren't actually all that common in the armpit itself.
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13 .And they don't flock to cotton.
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14 .But researchers say they thrive on the open-air lattice of synthetic fibers, where they sit chomping on the long-chain fatty acids in our sweat, turning them into shorter, stinkier molecules.
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15 .These findings might just explain one of the most vexing questions of adolescence:
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16 .why do stinky shirts smell so unpleasantly different from the body odor in the armpits themselves?
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17 .Could be because your favorite shirt has a microbiome of its own.
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18 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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