Physics is the fundamental branch of science that developed out of the study of nature and philosophy known, until around the end of the 19th century, as "natural philosophy." Today, physics is ultimately defined as the study of matter, energy and the relationships between them. Physics is, in some senses, the oldest and most basic pure science; its discoveries find applications throughout the natural sciences, since matter and energy are the basic constituents of the natural world. The other sciences are generally more limited in their scope and may be considered branches that have split off from physics to become sciences in their own right. Physics today may be divided loosely into classical physics and modern physics. Elements of what became physics were drawn primarily from the fields of astronomy, optics, and mechanics, which were methodologically united through the study of geometry. These mathematical disciplines began in antiquity with the Babylonians and with Hellenistic writers such as Archimedes and Ptolemy. Ancient philosophy, meanwhile - including what was called "physics" - focused on explaining nature through ideas such as Aristotle's four types of "cause."

How does the physics we know today - a highly professionalised enterprise, inextricably linked to government and industry - link back to its origins as a liberal art in Ancient Greece? Heilbron's crisp and witty book tells the 2500-year story and highlights the implications for humankind's self-understanding.

As the twentieth century ended, computers, the Internet, and nanotechnology were central to modern American life. Yet the physical advances underlying these applications are poorly understood and underappreciated by U.S. citizens. In this overview, Cassidy views physics through America's engagement with the political events of a tumultuous century.

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