The San Francisco Chronicle carries a New York Times article that describes how new research on the great pyramids of Giza, has found that some original parts of the massive structures appear to be made of concrete blocks.If true, historians say, this would be the earliest known application of concrete technology, some 2,500 years before the Romans started using it widely in harbors, amphitheatres and other architecture.
Full article: Egyptians may have used concrete, study contends (John Noble Wilford, New York Times)
