Teens invent a warning system for approaching ambulances, banana peel bioplastics, and flu drug modeling.
The phone maker is throwing in a free bundle with a longer-life battery and cover to protect it.
At $169.99, Light for Life is one of the most expensive flashlights out there, but it's also one of the greenest. It charges up in a minute and a half, gives you up to 90 minutes of light, and can be recharged more than 50,000 times.
Prototype relies on kinetic energy.
The iSimple MegaPhone is a battery-free solution to augmenting the sound of your iPhone speakers. Does it work?
Research could pave the way for battery-free gadgets that harness sound waves for power.
If you're tired of buying FM transmitters that cut in and out and deliver horrible sound quality, Sonnet offers you a product that might be of interest: a battery-free FM transmitter that--gasp--works!