To understand climate, scientists look to tree cores and ice samples. For a record of ocean pollutants, researchers are beginning to turn to whale ear wax. Since whales are unable to clean their ear canals, the wax builds up and creates numerous layers much like an old tree. Researchers from the Santa Barbara Museum of Natural History were able to extract a column nearly a foot long from a dead blue whale that washed up on a beach back in 2007.

 

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