Professor Li said that developing sustainable mobility in China required the use of three tools: education, administration and technology.

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"Some professors are calling it the Chinese Penn Station Movement, " says Professor Li, referring to the destruction of New York's railway station in 1963, which spurred preservation.

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As a Beijing resident, I was wondering how Professor Li of Tsinghua would answer the question, but he gave what I believe was the best response by repeating some of what he said in his opening remarks.

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Lin is an aggressive all-court player, with a powerful topspin forehand honed by his childhood coach: his father Li, a professor of engineering at the University at Buffalo.

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"Yau knows how to sell, " says Peter Li, a math professor at UC, Irvine.

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"The migrant workers of this generation are so different from earlier generations, " says Li Guorui, a psychology professor at East China Normal University in Shanghai.

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"It's always been one Li enterprise, " says the University of Washington professor.

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