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Higher status leads to a longer life
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US pledges to halve its nuclear stockpile
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Gene therapy to treat deadly cancer
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Genetically-modified virus explodes cancer cells
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First US case of West Nile Virus in 2004
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Industrial pollution may double twin births
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Baby born from sperm frozen for 21 years
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Doctors’ ties harbour disease-causing germs
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Low sperm counts linked to gene control flaw
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Global polio eradication back on track
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Drinking soda linked to gullet cancer rise
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Passive smoking kills one bar worker a week
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