A single oxygen atom bonded with two hydrogen atoms equals my favorite drink, or so I think that’s how it works. So yeah, this thing is too cool for school or work, you just fill up the three water powered batteries, plug them in and you’re good to go!
www.perpetualkid.com
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There is no such thing as “water-powered battery”.
This calculator is powered by corroding pieces of zinc, like (in)famous “water”-powered clocks.