More people are moving out of the U.S. than moving in for the first time since the Great Depression—a bad omen for the $38.8 trillion national debt

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Alison Francis,Senior Science Journalist

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Despite the headline, this isn't really a story about superconductivity—at least not the superconductivity that people care about, the stuff that doesn't require exotic refrigeration to work. Instead, it's a story about how superconductivity can be used as a test of some of the weirder consequences of quantum mechanics, one that involves non-existent particles of light that still act as if they exist.,详情可参考WPS下载最新地址

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