3. 数学之美：参数化几何体与克莱因瓶
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But in the worst-case scenario, the Deorbit Vehicle won’t be ready. Without it, a protocol agreed on in 2024, which relies on the Russian Progress spacecraft, could come into play. There will be vexing trade-offs to consider. Allowing the ISS to descend toward Earth on its own saves gas, which the ISS will need when it’s finally time to eject into the atmosphere and ensure a burial at sea. But a slow descent jeopardizes the machinery needed to maintain remote control.
60岁的挪威经济学家、世界经济论坛总裁布伦德在2月26日宣布辞职。此前几周，这个全球顶级政经精英组织针对布伦德与爱泼斯坦的关系进行了独立调查，据称未发现除先前已披露信息之外的其他问题。