# Entropy herbal pill and drug tests ?

I don't think you have anything to worry about. Older testing methods were more prone to false positives, but these days they have it down to a pretty smooth science. I've heard talk of valerian ...
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http://answers.yahoo.com//question/index?qid=20120901224718AAAYkqo

## How to Learn How to Derive a Mathematical Expression for the Entropy of an Ideal Gas of Photons?

This article shows the details of the mathematical derivation of the entropy of an ideal gas of photons based on the equation of forces that govern the equations of motion of photons.

http://www.wikihow.com/Learn-How-to-Derive-a-Mathematical-Expression-for-the-Entropy-of...