He starts scraping under my sideburns, holding the skin taut, and then shaves down in one stroke, exerting no pressure on the razor.

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Yet a falling oil price puts more pressure on Iran's economy at a stroke than have several years of international sanctions.

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"There's only so much swelling brain can tolerate until there's pressure on the nerves that control breathing and circulation, " said Dr. Roger Bonomo, director of stroke care at Lenox Hill Hospital in New York.

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