The average American flushes 24 gallons of water down the toilet daily, while—don't get me wrong, toilets; we appreciate all of your hard work—maybe some of the energy used in a flush could be put to an additional use.
Here's one way: harvest some of the energy from the water and use it for power. A team of researchers in South Korea have created a transducer that translates water motion—from toilets, raindrops, or other water-based uses—into electricity. The technical side is wonky, but essentially, by using the motion from a tiny droplet of water—30 microliters—the team was able to power a small green LED. It's a proof-of-concept demonstration, but scale up to a flushing toilet or a rainstorm, and you can see the appeal.
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