Want to experience marine life without getting wet? Sign up for a tour aboard the underwater bus. Like Courtney's ideal airplane, this French engineer's concept for an amphibious vehicle uses endless tractor treads instead of wheels. As a safety measure, the passenger compartment could eject the undercarriage and rise to the water's surface during emergencies. A small motor and propeller would transport the passengers to safety.
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.