Early results from NASA’s twin study show differences between astronaut brothers

NASA has yet to release the official result of its Twins study — a genetic experiment involving twin astronauts Mark and Scott Kelly to better understand the effects of long-term spaceflight on the human body. But early findings are already taking researchers by surprise, indicating that living in space drastically changes a person’s biology and even gene expression, Nature reports.

Between 2015 and 2016, Scott spent 340 consecutive days onboard the International Space Station, while his...

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