Before revision: upIbn al-Haytham () wrote of his camera obscura experiments in the Book of Optics.|alt=Ibn Al-Haytham (Alhazen) drawing In sixth-century Europe John Philoponus, a Byzantine scholar, questioned Aristotle's teaching of physics and noted its flaws.
After revision: In sixth-century Europe John Philoponus, a Byzantine scholar, questioned Aristotle's teaching of physics and noted its flaws.