DNA study of famed US sled dog shows what made him so tough

New York's Central Park has a statue dedicated to him, and there's even been a movie about him: a sled dog named Balto. Now he is the focus of a DNA study, 90 years after he died, to see what made the pooch so famously tough.

Skeletal remains debunk myth surrounding 1918 flu pandemic

Look back at the chronicle of global pandemics, and the flu pandemic of 1918 stands out as an anomaly for one reason: According to the history books, it struck healthy adults in their prime just as often, if not more so, ...

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