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Ancient civilizations were way smarter than you think. Check this out. Fact one, do you know? The Great Pyramid of Giza stood at 100 and 46 meters and was the tallest man-made structure on earth for nearly 4 thousand years. Built with no modern tools back, two Vikings didn't just fight. They carved lines into their teeth and filled them with black pigment, intimidation or fashion. We still don't know fact three. Roman concrete used volcanic ash, and it actually gets stronger over time, even underwater. It's why ancient harbors still exist today. At four, the Library of Alexandria may have held up to 400 thousand scrolls of ancient knowledge lost forever in mysterious fires. Ancient knowledge still blows our minds today, like share and follow for more hidden history.

Ancient civilizations were way smarter than you think. Check this out. Fact one, do you know? The Great Pyramid of Giza stood at 100 and 46 meters and was the…