The main branches of science also referred to as "sciences", "scientific fields", or "scientific disciplines" are commonly divided into three major groups.
These comprise the natural sciences, which study natural phenomena including fundamental forces and biological life as well as formal sciences such as mathematics and logic, which use an a priori, as opposed to factual methodology, while the social sciences, is study of human behavior and societies.
For the Natural sciences and social sciences which are known as empirical sciences, which means the knowledge must be based on observable phenomena and be capable of being tested for its validity by other researchers working under the same conditions.
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