LED lightbulbs are already energy efficient, but they would be even better if they could emit light without connecting to the grid at all. Brooklyn-based designer Danielle Trofe is trying to make that happen.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/aYwUcrvl9U4/sand-can-light-up-a-room-503861239
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