Google's CEO on the AI boom and potential bubble

From the BBC World Service: The artificial intelligence revolution is firmly underway, with tech giants investing billions in research and battling to secure key assets. It's led to a surging stock market, but also panic about the potential impact on jobs and society. Google is one of the companies investing heavily in the new technology. Today, we check in with CEO Sundar Pichai. Plus, the U.K. plans to ban the resale of event tickets for profit.