Scott Kelly shares the aches, pains and exhilaration of his out-of-this-world adventure

Astronaut Scott Kelly fields questions from
the media during a news conference at the Johnson Space Center in Houston, Texas, on March 1, 2016. Kelly, who spent a year in space, is the first person to spend a year in space twice. (Photo: NASA/Bill Ingalls)

Scott Kelly, the first person to spend a year