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After an elementary school shooting in Connecticut, Americans continue to struggle to understand why it happened and how to prevent future tragedies. Host Michel Martin discusses the shooting with author Paul Barrett, journalist Craig Whitney and psychiatrist Carl Bell. They talk about the politics and psychology of America's gun culture.

After the shock of a gunman killing 20 small children and six adults at an elementary school in Connecticut, districts are increasing police patrols, locking schools' doors and taking other steps.

President Obama and House Speaker John Boehner held another closed-door meeting Monday. If that secrecy troubled anyone, you'd expect it to be open-government watchdogs. But they have few objections. "Sometimes compromise has to be reached behind closed doors," says one.

The stage appears to be set for a renewed debate about gun control. The NRA and other proponents of gun owners' rights have been silent in the aftermath of the Newtown shootings, but many will question the benefits of possible restrictions.

Ayurveda is a form of traditional medicine that's thousands of years old. But some ayurvedic remedies have harmful heavy metal additives, including lead. And those remedies are finding their way to the U.S., as two recent cases of childhood lead poisoning in New York attest.

In recent years, states have passed a patchwork of immigration laws, at times running afoul of the U.S. Constitution. Advocates for the tough measures say state and local governments should still have a role, even as the debate shifts to the federal level.

Are we getting "Jack'd"? A surge in new caffeine-containing foods leads to new questions about just how much caffeine we're getting in our daily lives. Some advocates are calling for labeling, and they raise concerns about children's and teens' consumption.

As the year ends, commentator Ben Dolnick reflects on what he thinks is the most spurious bit of news from the world of American writers.

The combination of a powerful gun owners' lobby and a loss of public support for gun control has stymied efforts in recent years to tighten gun laws. But there are signs the Newtown massacre may prompt change on Capitol Hill.

The two washing machine-sized probes have been collecting data from the lunar surface down to the core. NASA ended the mission by flying the spacecrafts into the side of a mountain on the moon.