It's not quite as advanced as Terminator technology. But a new concrete that can heal its own wounds may soon bring futuristic protection to bridges and roads. Traditional concrete is brittle and is easily fractured during an earthquake or by overuse. By contrast, the new concrete composite can bend into a U-shape without breaking. When strained, the material forms hairline cracks, which auto-seal after a few days of light rain. Dry material exposed by the cracks reacts with rainwater. (source: news.nationalgeographic.com)
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