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It used to be easy to buy a light bulb. But the transition to more energy-efficient lighting means choosing from an array of products. We help you navigate the world of the 21st century light bulb.

In 2007, Missouri repealed a law requiring gun buyers to obtain a license demonstrating they'd first passed a background check. In the years that followed, the Johns Hopkins Center for Gun Policy and Research tracked the results. In the forthcoming issue of Journal of Urban Health, the center will release it's findings: The law's repeal was associated with an additional 55 to 63 murders per year in Missouri between 2008 and 2012. For more on the report, Audie Cornish speaks with Daniel Webster, the director of the center.

The Michigan power plant dumps a lot of warm water into Lake Erie. The warm water attracts fish. The fish in turn attract bald eagles. Almost 200 of them have been nesting at the plant.

Spain expelled its Jews in the 15th century, and some believe these conversos sought refuge from the Inquisition in what is now a Texas border region. Had one woman's family been Jewish all along?

Duck Derbies are very popular in Wisconsin. Because they involve placing bets on rubber duckies dropped into a fast-moving river, they are technically illegal. Wisconsin lawmakers have passed a bill exempting rubber duck high-rollers from a ban on gambling.

President Viktor Yanukovych said he was working with opposition leaders to end the violence that has claimed more than two dozen lives in the past two days.

People tend to relax as they get older, and most people sit more. Each extra hour of sitting increases the odds that they won't be able to get out of bed or do other daily activities.

Leopoldo Lopez tells his supporters they need to keep pressing for new leadership to replace the socialist government of President Nicolas Maduro. The government blames him for clashes in the streets.

At nearly 14 inches long, a mammoth mollusk is still alive and growing, says the biologist who found it in Denmark. The oyster is roughly comparable to a size 11 shoe.

A huge amount of ancient helium rises from the rocks beneath Yellowstone National Park each week — about enough to fill a Goodyear blimp. Scientists say it's due to a huge volcano underneath the park.