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Unusual Mars rock surprises rover scientist
US presidential debate a 'Game Changer'(视频)
Polio victim searches for love in 'The Sessions'
Colonizing expands in the American Northeast
Obama calls human tafficking 'slavery'
Many millions suffer from depression
Early detection and treatment a must for glaucoma patients(视频)
'Haunted Houses' attract big crowds on Halloween
Musical legend Chuck Berry still reeling and rocking on stage at 86
Meat was main dish for early humans
New report outlines strategy for HIV/AIDS
FTC takes on computer scareware scammers
Femen's topless protest tactics hit Paris(视频)
US president chosen by electors, not popular vote
Student street clinic helps homeless(视频)
Slow progress on curbing deforestation expected at climate conference
South pacific islands now totally powered by the sun
American history: A new world clash of cultures
America's break with Britain divides families and friends
William Shakespeare: Star of stage and screen
Maryland man is real hero behind 'Argo'
Marian Anderson: Her voice became famous around the world
Seeking HIV tests for all in US age 15-65
Effort underway to boost US voter participation(视频)
Words and their stories: baseball terms
Clowning around; making magic; hair care for less
Interfaith worshipers celebrate sea, surf
Violin maker keeps family tradition alive
How to win a debate, Presidential or otherwise
Number of Chinese students in US dramatically expands