<p>Physics is applied math. Chemistry is applied physics. Biology is applied chemistry. Psychology is applied biology. Sociology is applied psychology. Everything else is applied sociology.</p>
<p>[xkcd:</a> Purity](<a href=“http://xkcd.com/435/]xkcd:”>xkcd: Purity)</p>
<p>and the sciences and mathematics are basically a division of philosophy (empiracism and logic respectively) :-0</p>