American history: A new world clash of cultures

Unusual Mars rock surprises rover scientist

Demand for wheat growing in Sub-Saharan Africa

Nobel Prize in economics recognizes 'market designers'

New report outlines strategy for HIV/AIDS

How to win a debate, Presidential or otherwise

Some illegal immigrants allowed to stay under Obama order

'Haunted Houses' attract big crowds on Halloween

Early detection and treatment a must for glaucoma patients(视频)

Arrests in the shooting of a Pakistani schoolgirl

Refugee camps are a breeding ground for disease

How overfishing threatens Asia's wild fish stocks

West Nile surge keeps exterminator busy

Slow progress on curbing deforestation expected at climate conference

Seeking HIV tests for all in US age 15-65

Cheating scandal threatens Harvard's image

Research grows through citizen science

Palestinians cheer UN General Assembly vote

Conflict presses Syrian economy

Consumer spending will decline unless Congress averts fiscal cliff

Meat was main dish for early humans

United Nations report urges

Maryland man is real hero behind 'Argo'

Was Jesus married?

Clowning around; making magic; hair care for less

Words and their stories: Fall guy

Obama appeals to public about 'fiscal cliff'

Apollo's final missions: The last footsteps on the moon

US presidential debate a 'Game Changer'(视频)

South pacific islands now totally powered by the sun