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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
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2 .A common response to seeing an ant inside your house is to stomp on it.
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3 .But if you crush a member of the ant species Tapinoma sessile, you might catch a whiff of a strange smell,
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4 .a smell that reminds some people of blue cheese, rancid butter or rotten coconut.
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5 .In fact, the smell is so noticeable that the insect's common name is the "odorous house ant."
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6 .And many people call it the coconut ant.
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7 .In an effort to figure out why people have these reactions, researchers enlisted visitors at an event called the North Carolina BugFest.
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8 .One-hundred-forty-three volunteers smelled smushed ants and were asked to identify the scent from four choices: blue cheese, rancid butter, rotten coconut or just other.
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9 .Although Web sites overwhelmingly call the smell rotten coconut, almost 40 percent of the human judges picked blue cheese and about 25 percent picked rotten coconut.
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10 .More than 30 percent went with the choice of other.
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11 .The scientists then analyzed the chemicals responsible for the ant odor, as well as the smelly chemicals in blue cheese, fresh coconut and coconut buried underground for three days.
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12 .It turns out that the chemistry of the ants' scent is indeed similar to that of blue cheese and rotten coconut.
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13 .But not to fresh coconut.
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14 .And the researchers note that the Penicillium microbes that turn coconut oil rancid are also involved in the production of blue cheese.
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15 .The study is in the journal American Entomologist.
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16 .The researchers also noted that the most common write-in candidate as a description for the ants' aroma was "cleaning spray."
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17 .And one little girl told them that the ants "smelled exactly like her doctor."
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18 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Cynthia Graber.
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