Book excerpt: "In this wide-ranging and masterly work, Ahmad Dallal examines the significance of scientific knowledge and situates the culture of science in relation to other cultural forces in Muslim societies. He traces the ways the realms of scientific knowledge and religious authority were delineated historically. For example, the emergence of new mathematical methods revealed that many mosques built in the early period of Islamic expansion were misaligned relative to the Ka'ba in Mecca; this misalignment was critical because Muslims must face Mecca during their five daily prayers. The realization of a discrepancy between tradition and science often led to demolition and rebuilding and, most important, to questioning whether scientific knowledge should take precedence over religious authority in a matter where their realms clearly overlapped"--Page 2 of cover.