Two Key Things Astronaut Scott Kelly’s Body Will Teach Us About Living in Space

We’re all looking forward to interstellar travel and colonising Mars, but first, we’ve got a lot to learn about how the human body responds to the cold dark void of outer space. Scott Kelly’s year-long stint on the ISS, which ends tomorrow, is helping us answer some critical questions—including what weightlessness does to our vision, and whether all that extra radiation messes up our DNA. Read More >>