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📢 文末扫码进裙，免费领取双语精读版 The cement that could turn your house into a giant battery BBC Tech 17 July, 2024 | 1220 words | ★★ ★ ★ ☆ On a laboratory bench in Cambridge, Massachusetts, a stack of polished cylinders of black-coloured concrete sit bathed in liquid and entwined in cables. To a casual observer, they aren't doing much. But then Damian Stefaniuk flicks a switch. The blocks of human-made rock are wired up to an LED – and the bulb flickers into life. "At first I didn't believe it," says Stefaniuk, describing the first time the LED lit up. "I thought that I hadn't disconnected the external power source, and that was why the LED was on. "It was a wonderful day. We invited students, and I invited professors to see, because at first they didn't believe that it worked either." The reason for the excitement? This innocuous, dark lump of concrete could represent the future of energy storage. The promise of most renewable energy sources is t
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