Martin Harwit is Professor Emeritus of Astronomy at Cornell University. For many years he also served as Director of the National Air and Space Museum in Washington, DC. For much of his astrophysical career he built instruments and made pioneering observations in infrared astronomy. His advanced textbook, Astrophysical Concepts, has taught several generations of astronomers through its four editions. Harwit has had an abiding interest in how science advances or is constrained by factors beyond the control of scientists. His book Cosmic Discovery first raised these questions. The present volume...