The enduring mystery of how the ancient Egyptians built the Great Pyramid of Giza – with its 2. 3 million multi-tonne stone blocks – has puzzled researchers for centuries. Mainstream archaeology holds that the pyramids were constructed from natural limestone or granite blocks precisely cut and h...

Source: [SCMP](https://www.scmp.com/news/china/science/article/3366293/could-roman-concrete-have-clues-how-pyramid-giza-was-built-and-saved?utm_source=rss_feed)

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