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An explosion in Tehran kills an Iranian nuclear scientist while he's driving his car. It's the fifth such death in five years. Iranian officials immediately blamed Israel for the attack, which comes amid an escalating conflict between Iran and the West.

Audie Cornish talks with Thomas Haupt, respiratory disease epidemiologist for the Wisconsin Division of Public Health. He's the lead author of the study that helped uncover the source of a mysterious and large uptick in Legionnaires' disease cases. The study, "An Outbreak of Legionnaires Disease Associated with a Decorative Water Wall Fountain in a Hospital" was published in the online journal Infection Control and Hospital Epidemiology.

What if your New Year's resolution to get more exercise could be fulfilled — by taking a pill? That's the far-flung idea suddenly brought much closer to reality by the discovery of a hormone called irisin, which is produced by the human body in response to exercise.

The NPR science desk was inspired to take part in the fine, and longstanding, tradition of experimenting with Twinkies.

Iran has threatened to close the Strait of Hormuz, the strategic waterway that handles 20 percent of the world's oil, in retaliation for a new round of sanctions. Experts say Iran has low-cost options, such as mines, to wreak havoc and potentially close the strait.

The annual winter meeting of the Republican National Committee got under way in New Orleans, just hours after Mitt Romney won New Hampshire's Republican presidential primary. The Republican presidential candidate has won the first two contests in Iowa and New Hampshire, and leads polls in South Carolina.

Historically, Russians have often been content to accept strong leadership and stability. There are signs, however, that Russians are feeling let down by the government. A trip across Russia found many people patiently awaiting change.

In Power Concedes Nothing, civil rights attorney Connie Rice describes brokering peace between the Los Angeles Police Department and minority populations.

Pennsylvania, Ohio and West Virginia are waiting to hear which state Shell Oil will pick to host a huge new chemical refinery. The project would turn ethane gas, produced through "fracking," into ethylene, which is used to make plastics. The venture could be the biggest investment in the region in decades.

While GOP presidential candidate Mitt Romney savored his second consecutive win in the Republican nominating process, those who finished behind him in New Hampshire also continued on to South Carolina. They are hoping that it is in the Palmetto state where they can get his campaign to to stumble before it becomes unstoppable.