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Science: Chinese astronaut recalls hearing knock in space

China's first astronaut said in an interview broadcast by China Central Television that he heard a mysterious knock during his space mission in 2003. Yang Liwei, 51, said he heard the knock "from time to time." Yang said he was very nervous when he heard the sound, and moved close to the porthole to try to find out the cause. However, nothing out of the ordinary appeared both inside and outside. Yang currently serves as a major general in the military.