She wasn't pregnant. She hadn't been with anyone in months.

The poetic morbidity was unsettling, but her exhaustion overruled her caution. She clicked on.

She opened her browser. Her fingers, moving on autopilot, typed the phrase that had saved every medical student since 2008: .

She slumped into her desk chair, the glow of her laptop the only light in the cramped flat. “Okay,” she whispered, knuckles cracking. “Just a quick review. High-yield stuff.”

But the SlideShare had asked something else. It had asked: Why does a limb know to stop growing?