History of Islamic economicsBetween the 9th and 14th centuries, the Muslim world developed many advanced economic concepts, techniques and usages. These ranged from areas of production, investment, finance, economic development, taxation, property use such as Hawala: an early informal value transfer system, Islamic trusts, known as waqf, systems of contract relied upon by merchants, a widely circulated common currency, cheques, promissory notes, early contracts, bills of exchange, and forms of commercial partnership such as mufawada.
Abbasid architectureAbbasid architecture developed in the Abbasid Caliphate between 750 and 1227, primarily in its heartland of Mesopotamia (modern Iraq). The great changes of the Abbasid era can be characterized as at the same time political, geo-political and cultural. The Abbasid period starts with the destruction of the Umayyad ruling family and its replacement by the Abbasids, and the position of power is shifted to the Mesopotamian area.
Sciences grecquesvignette|Calcul de la circonférence de la Terre selon la méthode d'Ératosthène. Les sciences grecques sont tout à la fois un ensemble de questionnements, de méthodes et de résultats à l'origine de la pensée mathématique et scientifique, qui se développera à partir du jusqu'à nos jours sur tous les continents. , sous l'élan de philosophes en même temps penseurs et physiciens, ou même chefs religieux.