Over the past few decades, medicine has made leaps that once sounded like science fiction. You’d think, with such breakthroughs, we’d have the human body pretty much figured out. But the stories in this list say otherwise. Experts still can’t explain how one man’s second stroke undid the damage his first stroke caused. Or why a man woke up from his coma just long enough to say goodbye to his son. These are real cases, shared by real doctors, nurses, and patients in a thread that went viral for o