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NASA's Mars rover Curiosity used its Radiation Assessment Detector (RAD) to measure radiation exposure on the way to Mars. Now, it's recording similar data on Mars' surface. This image is a composite self portrait taken on Feb. 3, 2013.

Headed To Mars? Watch Out For Cosmic Rays

The dose of radiation an astronaut would experience on a trip to Mars is higher than the annual limit set for workers at nuclear power plants. But Mars enthusiasts say the radiation threat isn't high enough to cancel the trip.

Adam Nelson (left), has been awarded the gold medal in the men's shot put, after original winner Yuriy Bilonoh of Ukraine was found to have violated doping rules.

U.S. Shot Putter Awarded Gold, Years After 2004 Olympics

U.S. shot putter Adam Nelson has been awarded a gold medal from the 2004 Athens Olympics, after his rival at those games, Yuriy Bilonoh of Ukraine, was stripped of the victory last December for violating doping rules. International sporting officials formally made the change Thursday.

Arvind Mahankali won the 2013 National Spelling Bee after spelling the word "knaidel."

Desis Dominate The National Spelling Bee

When Arvind Mahankali won the Scripps-Howard National Spelling Bee last night, he became the sixth consecutive Indian-American winner and the 11th in the past 15 years.

A Cambodian survivor of the infamous Tuol Sleng prison (known as S-21) poses by a picture of "Brother Number Two" Nuon Chea last year.

Top Khmer Rouge Leaders Apologize For Regime's Atrocities

Nuon Chea, the No. 2 leader in the genocidal Cambodian regime, and head of state Khieu Samphan are on trial for genocide and crimes against humanity during the 1970s.

A file photo from 2011 shows a man touching a giant bronze sculpture of a mammoth in the Siberian city of Khanty-Mansiysk. A team of Russian and South Korean scientists who found a well-preserved frozen woolly mammoth carcass this month say it also included blood.

Report Of Liquid Woolly Mammoth Blood Prompts Clone Talk

Scientists in Siberia say they've extracted blood samples from the carcass of a 10,000-year-old woolly mammoth, leading to speculation that a clone of the extinct animal might someday walk the earth. But researchers say the find must be studied further to know its potential.

Sex Overseas: 'What Soldiers Do' Complicates WWII History

Historian Mary Louise Roberts' new book explores the interactions between soldiers and French women after the U.S. liberated France. She found that American soldiers horrified some towns by having sex with prostitutes in public places, and 1944 saw a wave of rape accusations against GIs.

Researchers Revive A Plant Frozen In Time

It sounds like something from the movies — scientists uncover a sample of plant material frozen inside a glacier for hundreds of years, bring it back to the lab, and watch as it comes back to life. Catherine LaFarge describes the work, and what it means for plant scientists.

The California State Capitol Building in Sacramento (file photo)

California Democrats Seek To Spend More on Education, Welfare

Revenues are up in California, and many legislative Democrats want to use the money to restore previous funding cuts. But Republicans say now is not the…

Firefighters Killed In Houston Motel Blaze

The firefighters may have been trapped when the roof of the Southern Inn collapsed about two hours after the five-alarm fire started. Officials say at least four firefighters were killed and five others were injured.

A MIG-29 and its armaments on display at the military aerodrome at Vasylkiv near Kiev, Ukraine.

U.S., Russia At Odds Over Moscow's Plan To Arm Syria

Russia's talk of sending advanced surface-to-air missiles and fighter jets to Syria has increased tensions between Washington and Moscow.

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