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Long before the Black Death killed millions across Europe in the Middle Ages, an earlier, more elusive version of the plague spread across much of Eurasia.

For years, scientists were unsure how the ancient disease managed to spread so widely…

About 68-million-years ago, during the Late Cretaceous, a giant fossil egg was laid in Antarctica. The excavated remains reveal that a huge marine reptile laid eggs instead of giving birth to live offspring, as scientists originally…