The philosophy of science is concerned with the assumptions, foundations, methods, and implications of science and with the use and merit of science. This discipline sometimes overlaps metaphysics, ontology and epistemology, for example, when it explores whether scientific results comprise a study of truth. In addition to these central problems of science as a whole, many philosophers of science consider problems that apply to particular sciences (e.g. philosophy of biology or philosophy of physics). Some philosophers of science also use contemporary results in science to reach conclusions about philosophy.