
A comparison of a NASA astronaut in orbit and his identical twin on Earth found spaceflight caused a cascade of biomedical changes, while suggesting how to manage them on long missions to the Moon and Mars https://t.co/rAhujldo4n via @WSJ Graphic by @DylanMoriarty pic.twitter.com/nRCr7Oktsh
— WSJ Graphics (@WSJGraphics) April 11, 2019
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