The Ancient Greeks may have invented an intricate pulley system of ropes and levers to lift vast blocks weighing up to 900 lbs when building their enormous structures. In the sixth century BC, the ...
The Great Pyramid of Giza—the largest of Egypt’s pyramids—consists of about 2.3 million limestone blocks. The smallest of these weigh two tons, while the largest weigh over 60. History says laborers ...
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