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Fields of science are commonly classified along two major lines:  

Fields of science are commonly classified along two major lines:  

*[[Natural Sciences|natural sciences]], which study [[natural]] phenomena (including [[biology|biological life]]), and  

*[[Natural Sciences]], which study [[natural]] phenomena (including [[biology|biological life]]), and  

*[[Social Sciences|social sciences]], which study [[human behavior]] and [[society|societies]].  

*[[Social Sciences]], which study [[human behavior]] and [[society|societies]].  

These groupings are [[empirical]] sciences, which means the knowledge must be based on [[observable]] [[phenomena]] and capable of being tested for its validity by other researchers working under the same conditions.

These groupings are [[empirical]] sciences, which means the knowledge must be based on [[observable]] [[phenomena]] and capable of being tested for its validity by other researchers working under the same conditions.