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"/>Killing of US school children sparks gun control discussion
Words and their stories: state nicknames, part 3
Britain could be on oath to EU exit(视频)
40 years Later, US abortion opinions remain passionate
Words and their stories: Santa Claus
New rules aim to improve US food safety
Let it snow, let it snow, let it snow!
Benedict departure will leave little room for change
Tattoos illustrate art of saving lives
Washington insider Susan Rice could face tough nomination battle
Getting a firm grip on weed control
Major progress in health through technology
First lady's new hairstyle creates buzz
A flower in winter: The story of the poinsettia
California attracts cars of the future
Social Innovation Summit 2012 comes to an end
Words and their stories: State nicknames, part 4
New technology used to track US flu outbreak(视频)
Abduction prompts girl to fight back for all women
Epilepsy disorder suffered by millions around the world
Teenager wins top prize for pancreatic cancer test
Discover America with American Mosaic!
Is investing in Africa a good bet?
Watching for early signs of autism in babies
Inaugural festivities put the 'party' into political parties
How babies learn, when, and even in what position
E-commerce challenges traditional stores
US economy faces another cliff
What online teens consider 'research'
Five actresses compete for coveted Oscar
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