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Biking to work is a great way to get exercise, save money and reduce pollution from cars. But does the risk of accidents cancel out all the good? Experience in Europe says no, but the U.S. lacks that tradition of urban bike travel.

Generations of physicists have claimed that time is an illusion. But not all agree. In his book Time Reborn: From the Crisis in Physics to the Future of the Universe, theoretical physicist Lee Smolin argues that time exists--and he says time is key to understanding the evolution of the universe.

After years of research, an animal scientist looking for ways to keep inflammation down in cattle came up with a novel approach: feed them flax. The flax in their food helps keep animals healthy and has an added benefit for people who later eat their meat: omega-3 enriched beef.

A study of mine blast victims finds further evidence that there's a resurgence of black lung among coal miners. The relatively young ages of some of the miners and their limited tenure underground suggests significant exposure to coal dust.

In 1958, Lewis suffered a precipitous decline in popularity when people learned that his new wife was not only 13, but also his cousin. Nobody would touch his records. Then, in 1963, he signed a deal with Smash and it looked like things were getting better.

Following her brief testimony, she broke down and pleaded with the court, "Please bring justice for my daughter." Meanwhile, lawyers for the accused say their clients have been "tortured" since the beginning of the trial.

On one side of the glass: A little girl running in circles. On the other side: A sea lion swimming in circles. When the little miss tripped, the sea lion came to a quick stop. It's a feel-good moment.

The political arm of the conservative Heritage Foundation wants GOP leaders to set aside legislation like the farm bill that might turn attention away from questions about the IRS and Benghazi.

The new version of the DSM, the manual of psychiatric diagnoses, is already sparking criticism. But psychiatrists say it helps make sure they're all on the same page.

The amazing tale of two sisters from a poor neighborhood — who play tennis unlike anyone before them and each reach No. 1 in the world — is one we're not likely to see again.