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The prefabricated nuclear reactors, which would be small enough to build in a factory and ship on trucks, would generate about one-tenth the power of a typical nuclear power plant. It's potentially a growth opportunity for American industry, but critics say the reactors carry a host of safety, security, environmental and economic concerns.

Twenty students and six teachers were killed when a gunman opened fire at Sandy Hook Elementary School in Newtown, Conn. As police continue to investigate the massacre, some argue that it's time to change the conversation about guns in America.

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.

A mysterious package arrived last week at the University of Chicago's admissions department addressed to Henry Walton Jones, Jr., otherwise known as Indiana Jones. Audie Cornish and Robert Siegel have more.

The Bushmaster semi-automatic assault rifle used in Friday's attack on an elementary school in Newtown, Conn., is a style of weapon used often in mass shootings. Melissa Block speaks with Malcolm Brady, retired assistant director of what was then known as the Bureau of Alcohol, Tobacco and Firearms, about the style of weapon and why it's so often linked to these tragedies.

A nonprofit called The Seasteading Institute is advancing a hugely ambitious scheme: constructing floating structures that will house hundreds of people in international waters, out of the jurisdiction of any nation. Now, the organization has attracted its first big name donor.

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.

Park Geun-hye's father was a military dictator who ran the country for nearly two decades. She has apologized for her father's suppression of democracy and appears to be slightly favored in Wednesday's presidential vote.

As the Supreme Court takes up fundamental challenges to voting rights laws and affirmative action, the storied NAACP Legal Defense Fund prepares to take on a new leader, Sherrilyn Ifill.