The Etón FRX3 is a miniature generator. One minute of cranking the hand turbine creates wattage for a 30-second call on a USB-connected phone, 10 minutes of radio time, or 15 minutes of illumination from its built-in flashlight. There’s also a solar panel, an AC adapter, and battery backup. Etón FRX3 Hand Turbine AM/FM Weather Alert Radio $60
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.