 For Marketplace, I'm Sabree Beneshour, in for David Brancaccio. First up, many businesses and government operations have been disrupted in the U.S. and around the world by a software problem knocking out computers using Microsoft Windows. This is affecting airline travel, some hospitals, and some financial services firms in the U.S., China, Australia, and Europe. My colleague David Brancaccio is tracking some of the ongoing effects. David?