Behold a "hydro-car." You might see its like in the next James Bond movie; this real-life model could be useful for navigating urban waterways or during heavy flooding. Obviously, to propel your car through the water there must be some sort of propeller hidden under the chassis, but a more immediate and basic requirement is that your car must be able to float.
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.