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The world had been fascinated with astronauts and spaceflight since well before the first crewed launches in 1961, when Yuri Gagarin, Alan Shepard, and John Glenn became household names. But when Alexei Leonov of the Soviet Union exited his spacecraft in March of 1965, a new era in spaceflight began. And when Ed White, clad in his gleaming space suit with a large American flag on his left shoulder, eased himself outside his Gemini spacecraft later that year, Americans too had a new space hero. They also learned a new acronym: EVA, short for extravehicular activity, more commonly known as “spacewalking.”