SCIENCE | FACTS | BEYOND | HISTORY | on Instagram: "It looks simple: a cup of water, a pinch of salt, and a glowing light. But behind it is electrochemistry at work. Salt dissolves into ions, making water conductive. When connected to electrodes, a small current flows, powering LEDs or tiny circuits. The ions carry charge between anode and cathode, creating a sustainable chemical reaction. This is the principle behind saltwater batteries — cheap, safe, and surprisingly effective. While it won’t
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