The Darning Calendar made by Zu Chongzhi is one of the most innovative calendar in ancient China，with the introduction of precession，the reform on the cycle of intercalary months，the newly measurement of length of tropical year and the establishment of the method of measuring the time of winter solstice being the most important contributions. The facts that he looked high on actual measurement，was industrious at thinking，goo d at using predecessor’s achievements and brave to struggle against fogeyish thought，all of which are all recorded in historical books，are important cause for his making a lot of innovation and obtaining so many achievements.In memorial of the great man of science，this article gives accounts on the causes and results of all that stated above.<br/>

Through the analyses of Needham’s ideas of history of science and his historical research on science，it is revealed that the content of "Needham’s Puzzle"is the following three questions:1.What caused the transcurrence of Chinese science in some certain periods?2. What caused the fusion of modern science with Chinese traditional science ?And 3.What delayed the fusion ?Needham focused on the 1st and 3rd questions，but gave little attention on the 2nd ones. To resolve the 2nd question is the task left by Needham.<br/>

Ehrenfest was a great physicist of the 20th century. He made particular contribution to appraising，comprehending and creating fundamental conception of the modern physics and acquired many achievements in theoretical physics. He built the Ehrenfest Urn model，completed the appraisable works about statistical physics，founded the adiabatic principle，advanced the conception of two level phase transition and formed his characteristic mode in scientific research. He had talkative abilities like Socrates also.By integrating all of those abilities with his humane characteristic，he had become worthy of the name of a great teacher finally.<br/>

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