Soft science is a new and comprehensive science that comprehensively uses the theories and methods of natural science, social science, mathematics and philosophy to solve various complex social problems brought about by the development of modern science and technology, and studies internal connection and law of development between social links such as economics, science, technology, and management, in order to provide optimized plans and decisions for their development.
According to the above definition, which of the followings is not soft science?
Psychology