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Periods of rain will drench portions of the northeastern United States from midweek through Friday. More >
Donald Trump and Hillary Clinton, in the opening presidential debate, both denied making statements that they are plainly on record as having said. More
Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.
Good news on the alien-life-hunting front: The towering plumes emanating from Jupiter's ocean-harboring moon Europa appear to be real.