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Predicting global killer whale population collapse from PCB pollution Until they were recognized as highly toxic and carcinogenic, polychlorinated biphenyls (PCBs) were once used widely. Their production was banned in the United States in 1978, though they are still produced globally and persist in the environment ...
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Newly Described Elephant Bird Is the Biggest Yet During the 19th century, European explorers enthusiastically combed Madagascar in search of the remains of the extinct elephant bird—one of the island's now-vanished megafauna, which left behind huge skeletons and the largest eggs of any known ...
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