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After months of campaigning, it's finally caucus day in Iowa. Polls still show a fluid race, with former Massachusetts Gov. Mitt Romney, Texas Rep. Ron Paul and former Pennsylvania Sen. Rick Santorum heading the pack.

Most hospitals make little effort to screen patients for tobacco use or to help smokers kick the habit permanently. That's a missed opportunity. Starting this month, though, hospitals can choose to adopt tobacco-cessation measures to help them comply with accreditation standards.

Republican presidential hopefuls were bearing down and trying to sway voters hours ahead of the first major test of the primary season. But more than a third of those participating in the state's caucuses say they still haven't made up their minds.

The scientist is known as much for his contributions to theoretical cosmology and quantum gravity as for his willingness to make science accessible for the general public. His work is the topic of a new biography by science writer Kitty Ferguson.

The tension has made the commodities market jittery. The price of oil jumped to more than $101 a barrel on the news.

Two-thirds of Americans are overweight. And when many of them try to take off the extra pounds, their bodies fight to stay fat. Tara Parker-Pope, who described "The Fat Trap" in The New York Times Magazine, and Dr. Arthur Frank talk about why some people appear more biologically prone to obesity.

While nothing substantive came of the talks, the fact that they happened is seen as progress. The two sides agreed to ongoing talks.

Morbidly obese people who had bariatric surgery had fewer heart attacks and strokes than similar people who didn't have the surgery, Swedish researchers found. Even so, a U.S. surgeon cautions that the benefits of the procedure don't necessarily outweigh the risks for many people.

It's on to New Hampshire for at least some of the Republican presidential candidates, where Newt Gingrich will take out a full-page ad in the New Hampshire Union Leader contrasting himself as a "bold Reagan conservative" to Mitt Romney's "timid Massachusetts moderate."

The Bowl Championship Series climaxes Monday with a game in New Orleans between Louisiana State and Alabama. But should the winner really be called the national champion? Just think how other sports would look if they were run by the BCS.