Philosophy[r]: The study of the meaning and justification of beliefs about the most general, or universal, aspects of things. [e]
Science[r]: The organized body of knowledge based on non–trivial refutable concepts that can be verified or rejected on the base of observation and experimentation [e]
Occam's razor[r]: Other things being equal—when several theories explain the same facts equally well, it is rational to prefer the most parsimonious of the theories. [e]
Reductionism[r]: The attempt to replace high-level explanations of phenomena by more basic explanations, often in terms of interacting subsystems or parts. [e]