A NASA astronaut who led the agency’s first medical evacuation has revealed that doctors still do not know why he suddenly lost the ability to speak in space. Mike Fincke, 59, a retired Air Force colonel, said the incident happened on January 7 while he was eating after preparing for a spacewalk. He was unable to speak for about 20 minutes, felt no pain, and then recovered quickly. “It was completely out of the blue,” he said, as fellow crew members alerted doctors on Earth and closely...