While the New York Times' Ben Brantley dubbed it "an oxygen-starved revival".

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It traverses oxygen-starved, earthquake-prone terrain that for most of the way is over 4, 000 metres (13, 120 feet) above sea level and rises to 5, 072 metres not far off the altitude of Mount Everest's base camp.

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One of the fire investigators, who had been standing by an open door in the living room, escaped moments before the oxygen-starved fire roared out of the room into the hallway a fireball that caused the corridor to go quickly into flashover as well, propelling the fire out the front door and onto the porch.

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Tests in primates had suggested NA-1 prevented brain cells dying when a stroke starved them of oxygen.

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