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Hillary Clinton and Donald Trump tangled Monday night over trade, taxes and how to bring good-paying jobs back to the United States as they opened their first face-to-face presidential debate. 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.