American history: A new world clash of cultures

Demand for wheat growing in Sub-Saharan Africa

World AIDS Day 2012 more hopeful than in past

Number of Chinese students in US dramatically expands

Words and their stories: Fall guy

Nobel Prize in economics recognizes 'market designers'

Femen's topless protest tactics hit Paris(视频)

Research grows through citizen science

Arrests in the shooting of a Pakistani schoolgirl

Colonizing expands in the American Northeast

Music classes in childhood may lead to changes in the brain

Obama appeals to public about 'fiscal cliff'

Seattle, 'City of Clocks' keeps on ticking

US president chosen by electors, not popular vote

Violin maker keeps family tradition alive

FTC takes on computer scareware scammers

West Nile surge keeps exterminator busy

Effort underway to boost US voter participation(视频)

'Haunted Houses' attract big crowds on Halloween

Rare fungal meningitis outbreak in United States

Consumer spending will decline unless Congress averts fiscal cliff

Seeking HIV tests for all in US age 15-65

How overfishing threatens Asia's wild fish stocks

Some illegal immigrants allowed to stay under Obama order

How to win a debate, Presidential or otherwise

Refugee camps are a breeding ground for disease

US presidential debate a 'Game Changer'(视频)

Many millions suffer from depression

New report outlines strategy for HIV/AIDS

Meat was main dish for early humans