"This is a rather unusual situation in physics. We perform approximate calculations which are valid only in some regime and this gives us the exact answer. This is a theorist's heaven- exact results with approximate methods."

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Are public school textbooks biased? Are they censored? The answer to both is yes. And the nature of the bias is clear: Religion, traditional family values, and conservative political and economic positions have been reliably excluded from children's textbooks.

— Paul Vitz