How Sharing with Strangers Became Normal

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 In this July 15, 2015, file photo, Uber driver Karim Amrani sits in his car parked near the San Francisco International Airport parking area in San Francisco.

Brad Stone, senior executive editor of global technology at Bloomberg News, joins us to discuss his latest book, The Upstarts: How Uber, Airbnb, and the Killer Companies of the New Silicon Valley Are Changing the World. Providing a history of Uber and Airbnb, Stone interviews the entrepreneurs who made getting into strangers' cars and staying in strangers' homes an average part of our modern lives.