Talk:435: Purity

Explain xkcd: It's 'cause you're dumb.

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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)

Shame it leaves out Engineering running parellel to all of them - maybe Engineering is just too busy getting shit done? -- 2.121.172.39 (talk) (please sign your comments with ~~~~)

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