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The bicycle sport is grueling, with riders traversing off-road courses dotted with obstacles. It's still little-known in the U.S., but is growing fast. Louisville, Ky., hosts the world championship competition this weekend — the first such event held outside of Europe.

There have been 20 reports of human salmonella infections linked to pet hedgehogs recently. Public health officials say people should keep the animals away from areas where food is prepared and served.

The Oscar-nominated documentary directed by Dror Moreh is not a defense of Israeli security policy, but a critique. The six Shin Bet heads Moreh interviews may believe in the tactics they devised, but it's the overall strategy they think is flawed.

The economy shrank slightly at the end of 2012, and the unemployment rate ticked up in January. But this spring's data could look much brighter if the housing market continues to heat up as expected. That's because the sector supports a variety of jobs, ranging from bricklayers to appliance manufacturers.

President Obama recently backed proposals by the "Gang of Eight" senators to overhaul the nation's immigration system. Host Michel Martin takes a look at how some border towns could be affected. She speaks with Scott Smith, the Republican mayor of Mesa, Arizona, and David Coss, the Democratic mayor of Santa Fe, New Mexico.

Some organizations have objected to the health care overhaul's rules, saying they violate religious freedom.

When the sun goes down, dung beetles rely on a galactic source--light from the Milky Way--to navigate, according to a recent report in Current Biology. Study co-author Eric Warrant, of Lund University in Sweden, explains how dung beetles see the starry night sky.

Why do we reach for that handful of M&Ms and other high-calorie treats under stress? In prehistoric times, such gluttony was probably a useful response to scarcity. That "feast before famine" instinct is less helpful in modern times, when obesity is a bigger health risk than starvation – but evolution hasn't had a chance to catch up.

China burns nearly as much coal as the rest of the world combined--and has 300 more coal plants in the works. But China also leads the world in solar panel exports and wind farms, and has a national climate change policy in place. Is the U.S. falling behind on climate? Ira Flatow and guests discuss how the world is tackling global warming--with or without us--and what it might take to change the climate on Capitol Hill.

When U.N. Ambassador Susan Rice's name was floated as a potential Secretary of State, there was quite a bit of hand wringing in Washington. It appears, now, at least some of it was probably for naught.