 The cybersecurity company CrowdStrike says the problem was with a software update it delivered to computers using Microsoft's Windows systems. Hundreds of thousands of screens went blank. NPR's Jenna McLaughlin has more. It's basically because of the unique position that CrowdStrike is in. It's one of the top cybersecurity vendors. It's worth billions, though its stock dropped a bit yesterday. So monitoring software has a very deep level of access to machines.