Image Credit: Sausly. Federica Mercuriello.
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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“在中国几千年的文明史上，帝王将相何其多，但在百姓头脑中留下记忆的也不过百来号人。”“青史留名与官阶并无本质联系，而是与做事相联系。”
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