Or zap airplanes with deadly rays. But it’s actually a solar autoclave, and it could become a very big deal in developing countries.

Autoclaves are the machines that using super-hot steam to kill bacteria on medical and dental instruments. They require energy to operate, of course, but a good deal of the world – encompassing perhaps 2 billion people – doesn’t have reliable power. That means no autoclaves, leaving doctors to use chemical sterilizers, when they can get their hands on them (they’re expensive and difficult to transport).