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Herman Cain is the only Republican presidential contender who's never held political office. Critics say that could be a disadvantage. Cain and his supporters say his business experience is an asset.

Late Cuban leader Fidel Castro leaves behind a complicated legacy both in his home country and abroad. Professor Mark Sawyer of UCLA looks at how his views on race affected generations of Afro-Cubans.

The Japanese government has announced that radioactive groundwater is leaking from the Fukushima nuclear power plant. To try and stop it, the Tokyo Electric Power Company, which owns the plant, has proposed building an underground wall of frozen earth around the reactors. The ice wall is supposed to keep groundwater from flowing in and radioactive water from leaking out, but nobody knows for sure whether it will work.

Democrats and Republicans are much less likely to live among each other than they were a generation ago. And new social-science research suggests that more Americans are motivated to move because they want to live among partisans of their own stripe.

Yeast scraped from a 35-million-year-old whale fossil is the key ingredient in a "paleo ale" from a Virginia brewery. Like many scientific innovations, the idea came about late one night over a pint.

Asteroid experts have been simulating a large asteroid heading towards Earth. Friday is the conclusion to the realistic simulation and will reveal how well planetary defense efforts work in this scenario.

Winters are getting warmer and shorter as the climate changes. That's helping rat populations grow in several U.S. cities.

When Leland Melvin pulled his hamstring during practice with the Dallas Cowboys, his NFL career was over. So he did the next logical thing: He joined NASA and became an astronaut.

New rules for Emmy nominations exclude some past winners, creating a bit of a controversy in Hollywood as Sunday night's awards show nears. Matt Roush, senior critic for TV Guide, briefs Liane Hansen on the new rules.

Many pregnant people struggling with substance abuse don't want to get help for fear of losing their children to the state. Casa Mía offers safe harbor.