Ruth Glasner presents an illuminating reappraisal of Averroes' physics. Glasner is the first scholar to base her interpretation on the full range of Averroes' writings, including texts that are extant only in Hebrew manuscripts and have not been hitherto studied. She reveals that Averroes changed his interpretation of the basic notions of physics--the structure of corporeal reality and the definition of motion--more than once. After many hesitations he offers a bold new interpretation of physics which Glasner calls "Aristotelian atomism." Ideas that are usually ascribed to scholastic...