BREAKING: Nancy Pelosi announces House moving forward with articles of impeachment

Science

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via Sergey Kavry

Science News

Video of spray-painted polar bear sparks concern, but experts say not to worry

Science News

18,000-year-old puppy found preserved in permafrost

Andrew Kelly / Reuters file

Environment

Earth's temperature likely marks hottest decade on record

World

How did wolves evolve into dogs? 18,000-year-old pup may hold the secret