mosques always during the islamic period have been as a particular species manifestation of taste and skill of real artists, and like a large canvas have displayed the set of popular arts in any period. in the meantime, stone , despite the difficulty in extracting and cutting, not abandoned ,and at  beginning of the qajar dynasty, trimmer of  this period  following the order and recommend of ma...

Smallpox, which currently is only of historical interest, was once one of the most terrible illnesses with high mortality and morbidity. In the late 18th century, the English physician and naturalist, Edward Jenner (1749 - 1823), discovered an efficient preventive technique against smallpox which he termed "vaccination". Afterwards, the practice of vaccination gradually became widespread when f...