【今晚开什么今期码香港_今年今期大乐彩开奖号】Stephen Hawking's final book launched in London, Britain

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Photo taken on Oct. 15, 2018 shows a still of a video describing Stephen Hawking's final theory on Supertranslations playing on screen at the global launch of "Brief Answers to the Big Questions", the final book by Stephen Hawking at the Science Museum in London, Britain. (Xinhua/Stephen Chung)

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