Review How two AI superpowers -- the U.S. and China -- battle for supremacy in the field

Emily Parker, who covered China for the Wall Street Journal, is the author of "Now I Know Who My Comrades Are: Voices From the Internet Underground." Silicon Valley was once able to write off Chinese tech companies as mere copycats. The big American players, from Twitter to Facebook to Google, all had a Chinese impersonator. But the rise of hugely successful Chinese messaging apps like WeChat -- not to mention all the U.S. tech companies that failed in China -- now make clear that the nation's tech companies should not be underestimated. In his book "AI Superpowers," Kai-Fu Lee, a well-known artificial-intelligence expert, venture capitalist and former president of Google China, argues that China and Silicon Valley will lead the world in AI.