Dina Temple-Raston

Landlords built Lahore in a haphazard way over centuries. They didn't concern themselves with city grids or sensible mapping. As a result, Lahore is renowned in Pakistan for being almost impossible to navigate.

And that's where Asim Fayaz and Khurram Siddiqi come in.

Tax evasion is a chronic problem in Pakistan — only about 2 percent of the population is registered in the tax system, and the government collects just 9 percent of the country's wealth in taxes, one of the lowest rates in the world.

But now a new investigative report is making headlines. It says that just a third of the country's 446 federal lawmakers bothered to file income tax returns last year.

Pakistani gunmen staged new attacks Wednesday on health workers carrying out a nationwide polio vaccination program. Six workers were killed Tuesday as they went house to house to administer the immunizations to area children in Karachi and the northwest city of Peshawar.

Although there were additional attacks, the Pakistani government vowed to continue the vaccination campaign — and eradicate the disease — even if there is bloodshed.

The Pentagon's top lawyer has talked about how the U.S. would deal with terrorism after al-Qaida's core was defeated. But experts say the talk is premature. The Arab Spring has helped al-Qaida affiliates proliferate over the past year. And while they might not be able to pull off large scale attacks, they are still a very real threat.

The downfall of CIA Director David Petraeus appears to have grown out of jealousy. He had been having an affair with his biographer, Paula Broadwell, and she allegedly sent harassing emails to a woman in Florida she thought was too close to Petraeus. Now the discussion is turning to what people knew and when they knew it and why this explosive story came out just days after the election. Audie Cornish talks to Dina Temple-Raston.