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For years, doctors attempted to create artificial hearts that mimicked the real heart—using methods that recreate blood pumping. Billy Cohn and Bud Frazier instead developed a continuous-flow device that has worked on calves and some humans, including patient Rahel Elmer Reger: The little quilted backpack held two lithium-ion batteries and the HeartMate II’s computerized controller, […]

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Life on the job with a team of nuclear divers. As nuclear power plants age, they require more upkeep—and much of that work can happen underwater: Last March, a tsunami hit Japan’s Fukushima Daiichi nuclear power plant, leading to a disastrous series of reactor meltdowns. The consequences were immediate. Germany vowed to phase out nuclear […]

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