NASA astronaut Shane Kimbrough gives Nikola a fist bump after a presentation about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)

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