1. There's roughly a one in five chance you will die in office.

43 different men have been President. Eight of them have passed before their terms were completed and a handful more have come close, notably Dwight Eisenhower, who during his eight years as Commander-in-Chief found time for a heart attack, a stroke, and surgery for a bowel obstruction, and Ronald Reagan, whose health problems included an assassination attempt. Which leads us to...