NPR News

GOP presidential candidates are touring Iowa ahead of next week's caucuses. The main issue for many voters there is the economy, but another hot topic is emerging: overhauling immigration policies. Iowa's Hispanic population is surging, and Republican candidates are struggling with how best to deal with voter concerns.

On the western edge of Phoenix, it's easy to find vast tracts of empty land once prepped for two-by-fours and work crews. Utility stanchions emerge like errant whiskers from the desert floor.

This is the land of zombie subdivisions. Some experts believe up to 1 million dirt lots in central Arizona were in some stage of approval for new homes when the market crashed.

"It's tragic," says Realtor Greg Swann. "It's heartbreaking."

Urban planners are floating a radical solution for areas like this. It's known as "smart decline."

Opposition to the administration's overhaul of health care has almost become an article of faith with every Republican running for president.

Candidates promise to repeal the law and its less-than-popular requirement for most Americans to either have health insurance or to pay a penalty starting in 2014.

2011 has been a momentous year in the 30-year-old AIDS pandemic.

The big breakthrough was the discovery that antiviral drugs can prevent someone who's infected with HIV from passing the virus to others. It's nearly 100 percent effective. That led President Obama to declare earlier this month that the U.S. will expand HIV treatment in hard-hit countries by 50 percent.