First battery-free cellphone makes calls by harvesting ambient power — ScienceDaily

https://www.sciencedaily.com/releases/2017/07/170705164453.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Ftop_news%2Ftop_science+%28ScienceDaily%3A+Top+Science+News%29

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