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As the new year gets under way, we take a quick temperature check on some key areas to see what the prognosis might be. The topics: politics — domestic and global — and economics.

In the 1970s, a sizable number of U.S. servicemen in Vietnam self-identified as heroin addicts. But when they returned stateside, the number of these soldiers who continued their addiction was surprisingly low. Why? Turns out a massive disruption in their environment and routine played a big role in helping them change their behavior.

MacFarlane is best known for creating the animated TV shows Family Guy, American Dad! and The Cleveland Show. But he's also a singer whose new album features songs from the Great American Songbook.

Starting later this month, the Transportation Department is requiring airlines to advertise prices which include all of the non-optional fees. That way passengers know the full amount they'd have to pay for a ticket. And, Exxon Mobil received some disappointing news from an international panel arbitrating a dispute between it and Venezuela. The panel awarded Exxon only about $900 million. It had been seeking $7 billion.

ABC TV rolls out a new version of an old show Tuesday — this time its Celebrity Wife Swap. The old Wife Swap wasn't getting great ratings, so they needed to up their game. Eric Deggans, the TV and media critic for the Tampa Bay Times, explains what celebrities do for reality shows.

And the race could go any which way, because 41 percent of Iowa caucus goers remain undecided. The caucuses start at 8 p.m. ET.

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.

At a campaign stop, Rick Santorum seemed to say he did not want to "make black people's lives better by giving them somebody else's money." In an interview last night, Santorum said he condemned all forms of racism.

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.