【香港六合今年今期报码现场_香港六合今年今期报码现场官网】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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