This volume is based on papers presented at the XV Internordic Philosophical Symposium in Helsinki in May, 2004. It covers a number of important and timely philosophical issues: naturalism - its strengths, weaknesses, and limits - in metaphysics, epistemology, and the philosophy of science; the relation between philosophical and scientific methodology; the ethics of science and, more generally, the place of science in society; the relation between the natural sciences and the humanities; as well as the ways in which scientific progress may challenge traditional philosophical concepts and...