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National Geographic: Egypt--Great Pyramid of Khufu at Giza
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www.nationalgeographic.com/...khufu.html
11 ancient history
giza
khufu
national geographic
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Nathan Kench
on 22 May 08
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The largest pyramid ever built, it incorporates about 2.3 million stone blocks, weighing an average of 2.5 to 15 tons each. It is estimated that the workers would have had to set a block every two and a half minutes.
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