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Ask Ethan: How are black holes active if nothing escapes from them?
一旦你跨入视界内部,你就再也无法出来。那么,黑洞是如何发射出各种各样的东西的呢?继续阅读《从一声巨响开始!》 »
Four Reasons You Should Know More About Gordon S. Wood, the Scholar of the American Revolution Who Died This Week at Age 92
普利策奖获得者历史学家,曾写过建国时的“激进主义”,在停车场的一场肇事逃逸事故中丧生