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A comment on Battery-free self-powered sensor harvests magnetic energy. Parent comment

Re:Battery-free self-powered sensor harvests magnetic energy by anvil-on-my-toe on Monday January 22, 2024 @04:16PM (#39095578)
And 3 days after another HN submission on a self-powered sensor that harvest energy from soil microbes.

https://news.ycombinator.com/item?id=39046697

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