Today on CNN 10, we breakdown a recent survey of US CEOs that found that nearly a third of large companies are exploring a four-day or four-and-a-half-day workweek for their employees. Then, CNN’s Kristin Fisher explains how astronauts today are benefitting from one of the darkest days in the history of space exploration – the 2003 Columbia shuttle disaster. All that and more on today’s episode of CNN 10.