More than 2 billion years ago, an asteroid slammed into Earth and created a 43-mile wide crater in Western Australia's outback. Now, researchers believe it is the oldest known impact crater, predating others by 200 million years. And it's possible that the impact led to a great thaw as Earth…

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The United States has its first confirmed case of a new virus that appeared in Wuhan, China, last month, the US Centers for Disease Control and Prevention announced Tuesday. The coronavirus has already sickened hundreds and killed six people in Asia.

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