 So what stopped the world last Friday? It was a routine software update, a defective line of computer code that instantly sent hundreds of millions of computers around the world into a reboot death spiral. It took down the banks, hospitals, air traffic control, the airlines, 911, police, fire, and who knows what else. The company is called CrowdStrike. It controls cybersecurity in almost every major computer system, government or private. It's everywhere.