When people ask me what it feels like the first time you spacewalk, what I tell them is this: Imagine you’ve been tapped to be the starting pitcher in game seven of the World Series. Fifty thousand screaming fans in the seats, millions of people watching around the world, and you’re in the bullpen waiting to go out. But you’ve never actually played baseball before. You’ve never set foot on a baseball diamond before. You’ve spent time in the batting cages. You’ve run drills and exercises with mock-ups and replicas. You’ve spent months playing MLB on your Sony PlayStation, but you’ve never once
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