A crew of four astronauts landed back on Earth after departing the International Space Station on Wednesday in NASA’s first-ever medical evacuation over an undisclosed ailment involving one of the crew members. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis, up-to-the-minute market data,