it's a lantern that uses salt water for power. Just scoop up some ocean water, or make your own salty substitute, and pour it in this tank. It houses a power cell that interacts with the salt water, creating energy. This bright idea will even charge your phone! They start at around 44 dollars.
This gizmo is meant to illuminate joggers at night. Just clip it on, start moving and... ahh, let there be light! this thing is bright, and since there is no battery,it will never run out of power it's lightweight, too.. Finally, a tangible result from jogging! They go for around 22 bucks.
This one's source of power -- burning small twigs or leaves - means you can charge your usb devices, even when you are out in the boonies. And it really cooks: It can even boil a pot of water. It runs around $130.
Innovative ways to toss those AA's, with energy to spare.
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