In keeping with alternative sources of power, how about rain?! This is pretty amazing: use rain drops to power LEDs. If you can light up an umbrella this way, could you light up a room on a rainy day? Could you create a ceiling that creates the illusion of sunshine, powered by rain, so it turns on automatically on rainy days? How about something like this on our cars, along with photovoltaic cells on the roof, plus the kind of dynamic energy recovery the Prius already uses to power its battery, plus...who knows?
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