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Hepatitis C is the most common blood-borne infection in the U.S., affecting four million Americans. We'll explore the cost of the disease to society, and how clean needle exchange programs can prevent its spread.

Host Gloria Penner talks with a Union-Tribune editor and a political analyst about Tuesday’s election results.

NPR News Investigation: Umar Farouk Abdulmutallab took two separate trips to Yemen, four years apart, to learn Arabic at a school near the capital. Officials now wonder whether the second trip, in 2009, was simply an excuse to gain entrance to Yemen to train with al-Qaida.

A San Diego teenager has won the Siemens Westinghouse Competition, a national contest in math and science. Sixteen year old Michael Viscardi will take home a 100-thousand dollar college scholarship.

New developments in Kenya suggest concessions between President Mwai Kibaki and opposition leader Raila Odinga have stalled, despite international pressure and violent unrest.

For the second time in 10 years, Tampa's science museum has canceled an exhibit after objections from black residents. The current controversy revolves around whether artifacts should be displayed from a pirate ship that sunk off the Florida coast. Many objected because the ship was also used to transport slaves.

No mountain gorilla is ordinary, but those found in northwest Rwanda are especially fascinating. They are the gorillas studied by legendary primatologist Dian Fossey — the "gorillas in the mist." Now, researchers are exhuming the descendants of those gorillas, in the search of clues to primate evolution. Researcher Erin Marie Williams is part of that team, and has sent dispatches from the field.

Twenty years ago this week, the Voyager 1 spacecraft captured a radical view of Earth. Shot from a distance of 4 billion miles, the "pale blue dot" image showed our planet as a tiny speck amid the vastness of space. Carl Sagan, who lobbied for the photo, said it reduced our entire world to "a mote of dust suspended in a sunbeam."

Hundreds of communities far from congested highways and belching smokestacks could soon join America's big cities and industrial corridors in violation of stricter limits on lung-damaging smog proposed Thursday by the Obama administration.

Besides Valentines Day, this weekend has plenty to offer, like the original balloon boy (er, man) at the New Children's Museum, hipster vaudeville at the Casbah, a not-so-mad scientist, and the San Diego Jewish Film Fest.