I buried myself in concrete to explain how it works
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I buried myself in concrete to explain how it works
Concrete = cement + sand + gravel. Cement is the most important man-made material on Earth.
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Concrete = cement + sand + gravel. Cement is the most important man-made material on Earth.
![I buried myself in concrete to explain how it works](https://i.ytimg.com/vi/dAik8EeDyEI/hqdefault.jpg)
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