Killing of US school children sparks gun control discussion

Ocean floor reveals past climate changes

California attracts cars of the future

Words and their stories: State nicknames, part 4

Major progress in health through technology

Televisions stole the spotlight at the consumer electronics show

Washington insider Susan Rice could face tough nomination battle

Words and their stories: state nicknames, part 3

Five actresses compete for coveted Oscar

Now on the iPad: Apps for orangutans

Teenager wins top prize for pancreatic cancer test

A flower in winter: The story of the poinsettia

WHO warns of malaria resurgence

United States Senate's process of confirming the president's nominees

Words and their stories: Santa Claus

Benedict departure will leave little room for change

What online teens consider 'research'

30,000 Sandy-damaged cars stored on eastern Long Island

Abduction prompts girl to fight back for all women

E-commerce challenges traditional stores

California voters reject food labeling requirement

New technology used to track US flu outbreak(视频)

New rules aim to improve US food safety

Gay rights groups push for anti-discrimination laws

US economy faces another cliff

Discover America with American Mosaic!

Inaugural festivities put the 'party' into political parties

Words and their stories: Belittle

Oxfam: Power, water shortages in Goma

Social Innovation Summit 2012 comes to an end