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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
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2 .Cerumen. It's a lovely word.
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3 .Especially considering that it means earwax.
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4 .And we're not the only species that produces the stuff.
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5 .Some whales build up waxes, along with lipids and keratin protein into what's called earplugs.
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6 .And researchers now know that examining these plugs tells them about a whale's lifetime exposure to pollution.
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7 .Alternating layers of dark and light in the plugs correlate to seasons of feeding or migration.
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8 .So the plugs have been used to determine a whale's age. Think tree rings.
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9 .In the latest study, scientists analyzed an earplug from an endangered blue whale killed by a ship near California.
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10 .They found that levels of stress hormones doubled over the whale's life.
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11 .They also found evidence that the whale had been exposed to pesticides such as DDT, with the highest levels during the whale's first six months of life.
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12 .The whale was likely exposed to the pesticides in its mother's milk.
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13 .They also found a couple of peaks of exposure to mercury.
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14 .The study is in the Proceedings of the National Academy of Sciences.
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15 .Future earplugs should offer additional clues about whale lives.
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16 .So look for researchers to give new attention to leviathan cerumen.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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