7 percent of his genes didn’t return to normal post-spaceflight, and that he and Mark are no longer identical twins.

https://news.google.com/news/amp?caurl=https%3A%2F%2Fwww.washingtonpost.com%2Fnews%2Fspeaking-of-science%2Fwp%2F2018%2F03%2F16%2Fthe-truth-about-astronaut-scott-kellys-viral-space-genes%2F#pt0-578999

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"People ask me what I do in the winter when there's no baseball. I'll tell you what I do. I stare out the window and wait for spring."

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