The companies we do business with know more about us than we realize. This hour, we’ll talk to Adam Tanner about one of the masters of mining personal data – Caesars Entertainment, which often knows its regular customers’ favorite games, drinks and hostesses before they even walk through the casino door. Tanner explains how they do it in his book, What Stays in Vegas: The World of Personal Data—Lifeblood of Big Business—and the End of Privacy as We Know It.