A to Z Health Guide 2007

The scientific bulletin of the year may be the stem-cell breakthrough. But 2007 provided a whole alphabet of big medical news. TIME's A-to-Z guide reviews them

By Coco Masters, Alice Park, Carolyn Sayre, Tiffany Sharples, Alexandra Silver and Kate Stinchfield

Pop Stars

John-Francis Bourke / zefa / Corbis
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A new study reveals that pop stars are twice as likely to die at a young age than the rest of us.

Average age of death:

U.S. 42

U.K. 35

Life expectancy at birth:

U.S. 78.0

U.K. 78.7

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