Successfully navigating a complex maze is the basic lab test for intelligence. Rats can do it. Cuttlefish can do it. And now, inanimate droplets of oil can do it. By creating a pH gradient, scientists induced the an oil drop to navigate a maze, an advance with important applications in drug delivery, urban planning, and computer modeling.
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.