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Inside a four-month simulated mission on the Red Planet.
A fundamental problem had stymied mathematicians for centuries. Then a former Subway cashier announced he’d solved it.


Channeling Sherlock Holmes, an attending physician unravels a hairy situation.
A recovering addict suffers from extreme nausea and stomach cramps. But the most obvious explanation may not be the right one.
The boy’s skin took on a sickly hue, and the whites of his eyes were anything but. A common condition in newborns spelled trouble in an older child.
How did this 30-something guy go from charismatic to catatonic? A trip down memory lane will get you there.
A 40-year-old demands to stay at the hospital, yet nothing seems wrong — until he explains why he can’t go home.
An athletic woman in her 50s suddenly can’t move her arm, then feels fine several minutes later. But an MRI reveals serious trouble elsewhere.