NASA Twins Study: Body Changes Over Time in Space
Brothers Scott and Mark Kelly were 51 in March 2015, when Scott began his fourth and longest space mission — commanding the International Space Station (ISS) for 340 days, which set an American record.

More TV, Tablets, More Attention Issues at Age 5
Compared with their peers who spent no more than a half-hour in front of a screen each day, 5-year-olds who logged over two hours were six times more likely to have "clinically significant" attention issues.