Today's answer is the Sudanese state of South Kurdufan. That's where emergency medical doctor James Maskalyk spent 6 months as a volunteer for Doctors Without Borders. He's written a book about his experience...and tells anchor Marco Werman about it.
Tens of thousands of Iranians marched in the streets of Tehran today, despite a government crackdown on protests and the news media. The World's Alex Gallafent explores the role played by the social networking site Twitter in the ongoing protests in Iran.