 Another theological development that may have facilitated the rise of science was the Condemnation of Paris (1277), which forbade teaching and reading natural philosophical views that were considered heretical, such as Aristotle’s physical treatises. As a result, the Condemnation opened up intellectual space to think beyond ancient Greek natural philosophy. For example, medieval philosophers such as John Buridan (fl. 14th c) held the Aristotelian belief that there could be no vacuum in nature, but once the idea of a vacuum became plausible, natural philosophers such as Evangelista Torricelli (1608–1647) and Blaise Pascal (1623–1662) could experiment with air pressure and vacua (see Grant 1996, for discussion).