Driving high doubles your chance of a motor vehicle accident, a new study says.

Smoking pot within three hours of driving doubles your chance of a major crash, Canadian researchers have found.

Their study, published Thursday in the British Medical Journal, the first to tackle the link between crashes and cannabis use, examined data from more than 49,411 vehicular crash victims and excluded any incidents involving alcohol.

"The level of impairment might not be as severe as alcohol intoxication, but it's there and it does require a public health response," expert Wayne Hall told ABC Science.

The researchers said more information is needed to determine the level of tetrahydrocannabinol (THC)- the active compound in marijuana - that causes impairment in driving competence.

But there is a positive link between THC levels and crash risk, the data show.

Despite the clear danger of driving high, law enforcement agencies have very few tools to address the problem, the expert said, despite the fact that that marijuana is the second-most sited substance in motor vehicle incidents.

Although it is easy to measure blood alcohol levels using a breath test, it is much harder to determine concentrations of THC in the saliva and gauge driver impairment on the spot, Hall added. 

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The World Press Photo of the Year shows a woman holding a wounded relative during protests against president Saleh in Sanaa, Yemen, in October.

A picture worth a thousand words of misery won first prize in a prestigious photo contest.

The World Press Photo of the Year 2011 was awarded to Samuel Aranda, a Spanish freelance photographer for the New York Times, for capturing a moment in Yemen that illustrated the stakes of the mass protests that rocked much of the Arab world since early last year. The image, taken Oct. 15th, shows a woman wearing a full-length burka cradling a wounded relative in her arms inside the shelter of a mosque in the city of Sana’a.

"I think it's really important when you receive such an award to remember that all of this work is for the people we're documenting," Aranda told The British Journal of Photography. "What I would really like is for this photo to help the people of Yemen. I think it's a country that is often forgotten."

Though the image is from Yemen, it symbolizes movement by millions of disenfranchised citizens that swept much of the Middle East last year, leading to regime change in Egypt, Libya and Yemen despite violent crackdowns. Breaking traditional and cultural taboos, women were often leading the charge in dangerous protests that successfully ousted Yemeni president Ali Abdullah Saleh’s decades-long hold on power. Saleh is currently in New York under diplomatic immunity while receiving medical treatment, the Associated Press reports.

Other World Press Photo 2012 award winners among the nine categories include images of Occupy Wall St., Egypt’s Tahrir Square protests, Japan’s devastating earthquake and tsunami , and poaching of endangered rhino horns. 

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Sheyla Hershey said her implants saved her when the airbags in her car didn't go off during a crash.

A woman is crediting her record-setting 38KKK bosom for saving her life after she wrapped her car around a tree.

Sheyla Hershey, of Houston, Tx., told Radar Online that she was driving to pick up her husband after a Super Bowl party when she lost control of her car and slammed into a tree.

She said the airbags in her Ford Mustang didn't go off — which could have meant serious injury for most people.

But Hershey, who, according to her website, was named as having the largest augmented breasts by her native Brazil's equivalent of the Guiness Book of World Records, says she was saved by her silicone.

“My implants saved my life, my breasts are very sore and I have some scratches on them but I know I would have been badly hurt without them because they are very close to the steering wheel,” she said.

At the time of the crash, Hershey told Radar she was taking drugs for depression, bipolar disorder, vicodin for a headache and a painkiller for the back pain.

She may face charges for driving under the influence of prescription drugs, and was arrested at the scene. 

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 A video of NBC late-night show host Jimmy Fallon and First Lady Michelle Obama competing in a potato-sack race.

You read that right. Also a push-up battle, a hula-hoop hip-off and a tug-of-war in the White House, all part of Obama’s “Let’s Move” exercise initiatives aimed at improving children’s health.

It’s got a goofy charm, and the kids will love it 

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