Adding on, paraphrasing from Anthony Kenny in an introduction to a volumen of his book A New History of Philosophy, philosophy is affectionately called the mother of sciences. When a philosophical question, e.g. what is free will, and is there free will, develops a well-defined approach to an answer, it often splits off into its own scientific field. For example, for the question of free will, we can investigate it as politics, and examine the structures of coercion by power, as behavior and psychology, and as biological processes.