Science & Environment
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Negative net migration hasn’t definitively happened in the U.S. for almost a century, not since the Great Depression. The U.S. native-born population is also in free fall, well below the replacement rate needed to maintain population numbers in the long run. With fewer immigrant arrivals already dealing a blow to the workforce, the shrinkage of the American taxpayer base is set to further widen the country’s deficit and hurt its prospects for economic growth.
New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »。爱思助手下载最新版本对此有专业解读
认准方向，就努力往前推，这份“较真”源自陈阳作为质检员的本职工作。“我在企业做质量控制，每天面对的是水产种苗饲料。饲料质量稳不稳，直接关系到养殖户这一年的收成能不能落袋。所以我必须精准细致，每一批次的检测数据，都是对养殖户的一份承诺。”陈阳说。