Scott Kelly spent a year in space, and came back with different DNA than his identical twin

In March 2015, Scott Kelly left on a voyage to the International Space Station. Mark, his identical twin brother and fellow astronaut, stayed behind. When Scott returned to Earth 340 days later, one thing became evident — the brothers were no longer identical.

Scott had grown two inches taller, lost body mass and he moved with slower speed and accuracy, according to findings published by NASA. But that’s not all – Scott’s genetic code was different.

NASA attributed this to “the...

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