 I'm Mike Marilla. Taking steps to address overcrowded classrooms. I'm Scott Gellman. If you've been feeling lonely lately, you're not alone. We'll take a look with a medical professional at ABC News. 9 o'clock. This is CBS News on the Hour, sponsored by O'Reilly Auto Parts. I'm Jennifer Kuiper. What's being called the largest IT outage in history has disrupted travel, businesses, and services around the world. CBS News Boston reporter Christina Rex on some of the following. New York's Memorial Sloan Kettering postponed all procedures.