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. »

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Proxima Fusion, a Munich-based nuclear energy startup, has outlined plans to raise about €2 billion to build a major fusion test facility in Germany that could be a milestone on the path to commercially viable fusion power. The company expects more than half of that, roughly €1.2 billion, to come from the German federal government, […]

栈(stack)是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序(单调递增或单调递减),从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。

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