Although Aristotle's contribution to biology has long been recognized, there are many philosophers and historians of science who still hold that he was the great delayer of natural science, calling him the man who held up the Scientific Revolution by two thousand years. They argue that Aristotle never considered the nature of matter as such or the changes that perceptible objects undergo simply as physical objects; he only thought about the many different, specific natures found in perceptible objects. Aristotle's Science of Matter and Motion focuses on refuting this misconception, arguing that Aristotle actually offered a systematic account of matter, motion, and the basic causal powers found in all physical objects. Author Christopher Byrne sheds lights on Aristotle's account of matter, revealing how Aristotle maintained that all perceptible objects are ultimately made from physical matter of one kind or another, accounting for their basic common features. For Aristotle, then, matter matters a great deal.