Anchor Katy Clark speaks with NASA astronomer Peter Jenniskens about his search in the Sahara Desert for an asteroid that recently fell to earth.

The World's Gerry Hadden reports on Germany's Turkish community. They're one of the country's largest immigrant groups, but a new study says they're having the hardest time integrating...and that could spell future economic trouble for Germany.

Our daily geography quiz.

Anchor Katy Clark speaks with Mohammed Ahmed, a physician in Darfur who runs a treatment center for victims of torture. His clinic was shut down by the Sudanese president's decision to expel some foreign aid agencies from Darfur.

Dr. Mohammed Ahmed: Physician and Human Rights Worker Sudanese Organization for Rights and Peace Building

Sudanese President Omar al-Bashir went to Egypt today despite the arrest warrant issued for him earlier this month by the International Criminal Court. The World's Jeb Sharp has more.

Sudan war crimes warrant

The World's environment editor Peter Thomson reports on the squabble over who should be responsible for greenhouse gas emissions linked to Chinese exports to the rest of the world.

The World's Mary Kay Magistad reports on China's efforts to reduce air pollution. Officials in the southern regions of Guandong say they're taking tough measure to cut back on emissions. But the air doesn't seem to be getting cleaner.

Anchor Katy Clark notes that United Nations chief Ban Ki-Moon called today for a one trillion dollar stimulus plan for the developing world.

Anchor Katy Clark speaks with Dambisa Moyo, an economist from Zambia whose latest book, "Dead Aid," argues that stopping most aid to Africa would actually spur economic growth.

Anchor Katy Clark speaks with The Washington Post's Brady Dennis about the latest goings-on in the London office of troubled insurance giant AIG.