Some devices are elaborately made to appear as if they operate on Faraday’s Law, when in fact the components have as much functionality as a pet rock All the rage a few years back, shake-to-charge ...

Compact and durable, the 450-lumen Aria 2 RGB from Petzl is a dual-fuel headlamp that can handle being dropped, dunked, and dusted. When work or play leaves you in the dark, a headlamp or flashlight ...