Purity is the 435th xkcd comic.
"On the other hand, physicists like to say physics is to math as sex is to masturbation."
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.