Talk:435: Purity

Explain xkcd: It's 'cause you're dumb.
Revision as of 07:20, 3 December 2012 by 24.85.241.128 (talk) (Created page with "See Comte's hierarchy of the sciences from [http://en.wikipedia.org/wiki/Law_of_three_stages his law of three stages]: Mathematics; Astronomy; Physics; Chemistry; Biology; Psy...")
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See Comte's hierarchy of the sciences from his law of three stages: Mathematics; Astronomy; Physics; Chemistry; Biology; Psychology; Sociology. --24.85.241.128 07:20, 3 December 2012 (UTC)