Illustration showing how water flowing between layers can create electricity. (Courtesy Youn Sang Kim)

Prof. Youn Sang Kim and his team at Seoul National University and Korea Electronics Technology Institute (KETI) have adapted a transducer to convert the mechanical energy from water motion into electrical energy.
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http://www.washingtonpost.com/news/morning-mix/wp/2014/04/24/the-power-in-a-toilet-flush/