(ISNS) — Of the Seven Wonders of the World only one remains standing: the 4,500-year-old pyramids of Giza in Egypt. How an ancient civilization organized the people, the supplies and the infrastructure to put up something that huge and long-lasting remains mostly a mystery and the topic of considerable controversy. Some cable television programs even credit aliens.
Archeologist Richard Redding of the Kelsey Museum at the University of Michigan thinks he has worked it out. The effort required industrial farming, cattle drives, and tens of thousands of workers. No Martians.
The best estimates are that some 8,000-10,000 workers at a time labored over 20 years, Redding said. The pyramids were built during the 3rd and 4th dynasties of what archeologists call the Old Kingdom, from 2600-2100 B.C. Read more.