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 …
Archaeology and Islam #30 - The Origin of the Mihrab:
Did the prophet Muhammad initiate the use of the Mihrab or did it come later? Why do the first mosques have no mihrab? What was used to indicate the direction of prayer before the Mihrab was invented, …
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