NASA wanted to know if humans could handle life on Mars. Four volunteers just put it to the test

One of NASA’s strangest, most daunting missions just wrapped up – and its crew didn’t even leave Earth’s atmosphere. Four crew members emerged over the weekend after spending a full year cooped up inside a 1,700-square-foot habitat designed to perfectly simulate life on Mars. The mission, stationed at Johnson Space Center in Houston, is the next best thing to a real mission to Mars, giving scientists an opportunity for a lower stakes run-through without the extreme risks posed by the re...