ABSTRACT
Philosophy of science is a difficult subject to define in large part because philosophy is difficult to define. But for at least one controversial definition of philosophy, the relation between the sciences-physical, biological, social, and behavioral-and philosophy are so close that philosophy of science must be a central concern of both philosophers and scientists. On this definition, philosophy deals initially with the questions the sciences cannot yet or perhaps can never answer, and with the further questions of why the sciences cannot answer these questions.
