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Why some whales are giants and others are just big

Sophisticated sensors suction-cupped onto the backs of whales are helping biologists answer two long-standing questions: Why are whales so big? And why aren’t they bigger? Being big in general boosts whales’ ability to reach more food for less effort, helping...

What Was the Black Death?

The Black Death of the 14th century is well known. When historians discuss "the plague" they are usually referring to this epidemic of bubonic plague caused by the bacterium Yersinia pestis. In his book, "The Black Death, 1346-1353: The Complete...

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