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Santorum's returns may allow his critics, both those aligned with Mitt Romney, his chief rival for the Republican presidential nomination and those who aren't, to attack the former U.S. senator from Pennsylvania for not giving as much to charity as many others at his income level.

The highly-anticipated gathering of flu experts has been described as a fact-finding session that will focus on understanding how bird flu studies done at Erasmus Medical Center in the Netherlands and at the University of Wisconsin were performed and overseen by the relevant authorities.

What's the difference between primaries and caucuses, and why do states have different systems for choosing delegates? Political scientist Josh Putnam explains how delegates are picked, and how the process changed after the 1968 Democratic National Convention.

In this rebroadcast from 2010, the musical theater legend talks about writing the lyrics and music for several of his productions, including the 1981 musical Merrily We Roll Along, which is currently in the middle of a two-week run in New York City.

China's economy sailed through the financial crisis unscathed — at least in the short run.

The United States and five other nations are embarking on a new program to limit pollutants connected to global warming. But they're not targeting carbon dioxide with this effort — instead, they're looking at methane gas, and soot.

Amanda Knox, the U.S. college exchange student who won an appeal to overturn her murder conviction in Italy last October, has signed a deal to write a memoir — for which she'll earn nearly $4 million, according to reports.

White House officials and Cabinet secretaries will soon be helping to raise money for a pro-Obama superPAC, Priorities USA Action. The superPAC says it's being careful to stay within the rules, but some argue that it shouldn't be happening at all.

A fleet of Google's robotic cars has been tested more than 200,000 miles over highways and city streets. And Nevada has finalized rules that give special driving permits to the self-driving cars.

In his book Concrete Planet, author Robert Courland discusses why the concrete first used by the Romans is more durable than the concrete used in most present day buildings. Plus, mineralogist Peter Stemmerman tells us about his invention, Celitement and why it is greener than Portland cement.