The History of Concrete and the Nabataeans:
Professor Dr. Joseph Davidovits is a recognized world expert on ancient cements and concretes. Much of the following material is taken from his website: http://www.geopolymer.org. Dr. Davidovits is …
Gryn is located in the southern highlands of Jordan, south of Ayl. On the hill-top stands a fortification, while the artesian wells empty their water into ancient cisterns and aqueducts below the …
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