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Muscle loss conjures two very different pictures. One is an astronaut back from six months on the International Space Station, legs shaking as gravity reasserts itself. The other is an older person, hands gripping the armrests, trying to stand up from a kitchen chair. On the surface, these look like separate worlds—one a high-tech frontier,…

The Common Thread Between a Sprinter and a Grandparent I often start my lectures with two photographs. One shows an Olympic sprinter mid-stride, every fiber taut and purposeful. The other shows an octogenarian gripping a walker, knuckles white, willing their legs to cooperate. The audience sees two completely different realities. I see a single biological…

Picture an astronaut stepping off a capsule after six months on the International Space Station. There is no heroic stride. Instead, you see a wobble—a cautious, almost bewildered relearning of how feet meet ground. Now shift your gaze to a hospital room. An 80-year-old, a week into bed rest after a hip fracture, tries to…

A bedridden patient, seventy-something, staring at a hospital ceiling. An Olympic sprinter, leg in a cast, watching the clock tick on a season that’s slipping away. On the surface, they couldn’t be further apart—one is fighting the long slide into frailty, the other is just furious about a stolen summer of competition. But slide a…

I see that look all the time. A pleasant, glassy nod. People picture rockets tearing into a sunset, astronauts bobbing around in a tin can, or some telescope squinting at a dot impossibly far away. Then it comes, wrapped in polite confusion: “But what does all that money actually do for us down here?” The…

Every night, millions of people lie awake, staring at the ceiling, trapped in a silent argument with their own biology. On Earth, insomnia is a sprawling puzzle of anxiety, light pollution, and overstimulation. But to understand its deepest roots, we have to look somewhere with no ceilings at all—about 400 kilometers above the surface, aboard…

I still remember my first night on call in a terrestrial emergency department. A patient came in with a fever and a racing heart. The diagnosis was sepsis, a familiar enemy. The treatment was a cascade of interventions I could recite in my sleep: fluids, antibiotics, monitor. The human body was a book I had…

I started reviewing astronaut health data expecting to rely on the same clinical logic I’d used during my internal medicine rotations. That assumption fell apart with the first case. A 45-year-old crew member, no history of back trouble, developed an acute lumbar disc herniation three days after landing. On Earth I’d have ordered NSAIDs, physical…

Most people figure a good experiment runs smoothly—instruments humming along, data pouring in clean, results snapping into place with a satisfying click. Back in grad school, I believed that too. I’d calibrate detectors until my eyes crossed, hunt down every stray signal, and take any blip as a personal screw-up. Then, during a graveyard-shift run…

I still remember walking into the flight surgeon’s office at Johnson Space Center for the first time. I’d spent a solid decade in a busy Houston hospital—infections, fractures, the long slow management of diabetes and heart failure. I figured the human body was the human body. Then someone handed me a stack of astronaut health…