Investors have focused on valuations in recent weeks.Michael Burry's name has been echoing throughout Wall Street in recent days, much as it did several years ago when the hedge fund manager bet against the U.S. housing market -- and won. Burry made $700 million for his investors back then, during the subprime market crash, and his story was popularized through the movie "The Big Short." Today, though, Burry hasn't been taking action against the housing market; instead, he's focused on artificial intelligen ...