Kelsey Research Scientist Richard Redding, who is chief research officer at Ancient Egypt Research Associates, has been making discoveries about how the monumental pyramids at Giza could have been built in 20 years during the 3rd and 4th Dynasties (2600-2100 BC) in Egypt. His research suggests how the 8,000-10,000 laborers were fed and what their diet consisted of. His discoveries are quoted extensively in a Life Science article:

Another summary of his research can be found in Inside Science at: