Solar powered calculators may be well and good, but what happens when their battery backup runs out? They're pretty much almost useless unless you change the battery. Here comes the water-powered calculator. With just plain old tap water, you can charge up the calculator for up to a month, using only less than a cup of water. The inventors behind the device state that the water reacts with a zinc anode and cathode, creating an electrical current that powers the calculator. Although batteries aren't that costly, this is pretty green and environment friendly.
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