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This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

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Cerumen. It's a lovely word.

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Especially considering that it means earwax.

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And we're not the only species that produces the stuff.

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Some whales build up waxes, along with lipids and keratin protein into what's called earplugs.

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And researchers now know that examining these plugs tells them about a whale's lifetime exposure to pollution.

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Alternating layers of dark and light in the plugs correlate to seasons of feeding or migration.

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So the plugs have been used to determine a whale's age. Think tree rings.

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In the latest study, scientists analyzed an earplug from an endangered blue whale killed by a ship near California.

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They found that levels of stress hormones doubled over the whale's life.

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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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The whale was likely exposed to the pesticides in its mother's milk.

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They also found a couple of peaks of exposure to mercury.

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The study is in the Proceedings of the National Academy of Sciences.

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Future earplugs should offer additional clues about whale lives.

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So look for researchers to give new attention to leviathan cerumen.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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