Two spaces after a period: Why you should never, ever do it.

Every modern typographer agrees on the one-space rule. It's one of the canonical rules of the profession, in the same way that waiters know that the salad fork goes to the left of the dinner fork and fashion designers know to put men's shirt buttons on the right and women's on the left. Every major style guide — including the "Modern Language Association Style Manual" and the "Chicago Manual of Style" — prescribes a single space after a period.

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