As we saw in tech company earnings over the last couple of weeks, tech giants are making a lot of money in cloud computing. Amazon, Google and Microsoft rent out computer storage and computing power to smaller companies for lots of profit, and they spend a lot of money on the business themselves. "Cloud" is kind of a misleading name because it's really a very expensive physical infrastructure on the ground, lots of powerful computers that live in huge temperature-controlled buildings called data centers. All big tech companies spend a lot on data centers for storage, computer power for artificial intelligence and to deliver services to their customers. And the business is only growing. Molly Wood talks with Rich Miller, the founder and editor of Data Center Frontier, a news site that covers cloud computing and data centers. Today's show is sponsored by Pitney Bowes and Ultimate Software.