Earlier in 2007, Brazilian club Flamengo said they would not play again at altitude after several of their players needed oxygen during a game against Bolivian team Real Potosi, held at nearly 4, 000m (13, 120ft).

BBC: Fifa bans high-altitude football

Ben Yehuda asked a passing British climbing team to help him, to give the man oxygen.

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The medical team started Sara on intravenous antibiotics and high-flow oxygen through a mask.

NEWYORKER: Letting Go

To study the neurology of tickling, Dr Blakemore and her team stuck volunteers into a magnetic-resonance-imaging machine (which monitors oxygen flow to the brain, and thus indicates the amount of activity in that organ's various parts).

ECONOMIST: Neuroscience: Tickled curiosity | The

U. team injected him with antibiotics and sedatives, put a breathing tube down his throat, and forced pure oxygen into his lungs.

NEWYORKER: Big Med