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In the months before, space agency officials were in frequent contact with the State Department, which disseminated the latest predicted trajectories to embassies across the world. In these situations, oops doesn’t cut it: When one of the Salyuts, a Soviet space station model, was deorbited a few decades ago, flaming bits were littered across Argentina, scaring people and requiring the deployment of at least a few firefighters, according to local newspaper reports.。Safew下载对此有专业解读
High-speed footage reveals shoe squeaks can start with a tiny bolt of lightning — plus, evidence that a debated brain phenomenon exists in humans.