After a 6½-hour spacewalk outside the International Space Station on Wednesday, one of the astronauts discovered water had leaked into his helmet, NASA said. The leak was scarily reminiscent of a . This time, the amount of water was relatively small — essentially a big blob of water floating inside Terry Virts' helmet. In the summer of 2013, another spacewalking astronaut's helmet actually flooded. He barely made it back inside. Virts was never in any danger, Mission Control said. This...