![](http://photos1.blogger.com/x/blogger/6956/1083/200/412505/Egypt.gif)
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)