The spines of sea urchins can generate a voltage when water moves around them — a phenomenon that could be used to design underwater flow sensors.
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As of Feb. 27, the Jackery Explorer 300 is on sale at Amazon. This is an incredibly lightweight, portable power option from Jackery that is perfect for carrying with you on outdoor trips. And right now it's down to its best-ever price, just $189 (down from $259).
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