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It was the masterful late and lunatic comedian Bill Hicks who pointed it out in the sarcastic terms of those really wary intelligent beings from another planet or even universe coming to earth, what we call UFOs. Why did they invariably seem to show
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汤姆和丹尼尔走在上学的路上，两人聊起了UFO，丹尼尔说他见过UFO，而且还和外星人说了话。这是真的吗？ Listen Read Learn Tom: Do you believe in UFOs? Daniel: Of course, they are out there. Tom: But I never saw them. Daniel: Are you stupid? They are called
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This is Scientific American's 60-Second Science, I am Karen Hopkin. This'll just take a minute. Biologists, traditionally track migrations by tagging animals with devices that allow their movements to be monitored. But Homo sapiens can't be fitted wi
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By Carol Pearson Washington, DC 08 November 2006 watch Heart Stent report Heart stents are lifesaving medical devices that help prevent heart attacks. Most of these stents are coated with various drugs, but mounting data suggest drug-coated stents c
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