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And even exposure data isn't a reliable measure because it can vary highly by such factors as age, gender, the body part exposed to radiation and the patient's size, says James A. Brink, chief radiologist at Massachusetts General Hospital and co-chairman of Image Wisely.
WSJ: New Tracking of a Patient's Radiation Exposure
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The ECB for its part is exposed in two main ways.
ECONOMIST: How much do Greece and the rest of Europe stand to lose?
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If American technology develops as expected, by 2018 the new shield would cover almost all of NATO's European members against an Iranian attack only a small part of Turkey would be exposed.
ECONOMIST: Missile defence in Europe: The next salvo | The
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Neither workers nor taxpayers would be exposed to the risk of fiscal irresponsibility on the part of politicians.
FORBES: Here's A Radical Idea: Fiscal Responsibility
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"The toughest part of the job is being so exposed, " he says.
FORBES: Reviving Novartis
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Now that we're exposed to less dirt and bacteria (thanks in part to our obsession with antibacterial everything), and have fewer scourges like polio and parasites to fight, our immune systems are quicker to overreact to otherwise harmless substances like pollen, says Levetin.
CNN: Why your allergies are bugging you
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With their very first cry, this most precious, vital part of ourselves -- our child -- is suddenly exposed to the world, to possible mishap or malice.
WHITEHOUSE: President Obama Speaks at Newtown High School
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But if the northern part of the Americas seems to be making up, the summit exposed the gulf between north and south.
ECONOMIST: The Summit of the Americas: Loveless brothers | The
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The Yugoslav army, for its part, has little night-fighting ability and lacks ground radar to protect its exposed checkpoints.
ECONOMIST: Kosovo
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Broad was part of a four-man attack in Chittagong, a selection decision that was exposed during the hosts' second innings.
BBC: Stuart Broad feeling fresh after first Test toil
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Mr Chen exposed how local authorities in Linyi, in Shandong, forced thousands of women to have abortions or be sterilised as part of China's one-child policy.
BBC: China activist Chen Guangcheng leaves US embassy