Earthquakes, terrorist attacks, and muggings have all scared people to death. Sporting events, too, sometimes cause frenzied fans to drop dead. Neurologist Martin Samuels of Brigham and Women's Hospital explains how positive or negative excitement can lead to a heart-stopping surge of adrenaline.
A gallery of inventions designed to fight the fear of being buried alive
Produced by Christopher Intagliata, Associate Senior Producer