Physicists demonstrate how entangled quantum particles can improve the sensitivity of non-local, long-distance light phase measurements such as for telescope arrays observing faint astronomical objects

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The astronauts were helped on to a stretcher, which is standard practice after spending so long in the weightless environment.

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表面的原因并不复杂——大宗商品价格下跌。超级周期结束,铜价回落,矿业投资减弱,这是几乎所有资源出口国都会面临的冲击。但更深层的原因在于,秘鲁极不稳定的政治环境。