The ocean was still a great unknown in the years between the world wars, and some scientists speculated that the bottom was a "dead zone" where the pressure and darkness made life impossible. It was in this atmosphere of total uncertainty that William Beebe and Otis Barton built a hollow steel ball called the Bathysphere.
It should seem that sharks are used to bad news by now. So perhaps there's no better a time than now for some good cheer. Indeed, a recent study from Brazil suggests promise in a humane, non-lethal, and impressively successful method to keep beaches clean of attacks -- without putting a bullet in anyone's brain.