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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.


Severe belly pain lands a young woman in the hospital not once but three times — yet abdominal scans find nothing.
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.