Scientists have struggled to understand the effects of space on the human body in large part because it’s difficult to blame changes on spaceflight alone.
Twin studies are the closest scientists can get to such understandings.
But identical twins who are both astronauts is a rare occurrence.
We hear about the latest results in the first-of-its-kind longitudinal study of twins Scott and Mark Kelly, both astronauts, one of whom spent a year onboard the International Space Station.
Today on Tech Tuesday on All Sides, the impact of space travel on humans, and more.