Fireflies light up summer lawns at dusk through chemical reactions, which take place between a light-emitting substance and its related enzyme. Luciferin and luciferase, respectively, could provide a natural, electricity-free glow for ambient lighting and other uses. But previous experiments to this end have not yielded very bright light.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.