This document discusses intelligent design and why it is not considered a scientific theory. It provides background on intelligent design and its arguments, such as that biological systems are too complex to have evolved naturally. However, the document argues these claims have been disproven as biological systems have been shown to evolve gradually from simpler precursors. It also discusses how intelligent design is not falsifiable and therefore not a valid scientific theory according to Karl Popper's definition. The document concludes intelligent design is a religious argument disguised as science and has no place being taught as such in public school science classes.