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NASA engineers are struggling to get to the bottom of a mysterious technical problem that scrubbed Wednesday's planned launch of the space shuttle Discovery. Astronauts were already on board when word came that the launch was a no go. They now need to wait at least days if not weeks for another chance.

Mykolaiv sits near the edge of Russian-occupied areas of the country. We visit on the eve of an expected new Russian offensive in the area.

As a grand jury's term expires in the investigation of the outing of CIA operative Valerie Plame, special counsel Patrick Fitzgerald schedules a 2 p.m. news conference Friday. Speculation swirls regarding potential indictments.

Some scientists have long suspected that cats, which are strict carnivores, are "sweet blind." Now there's proof: Cats lack the receptor for sweetness. The discovery opens a window on what taste is for and how it evolved. It may also help cat food makers producer a product that even sick cats will eat.

Michele Norris talks with John Allen, Vatican correspondent for the National Catholic Reporter and author of The Rise of Benedict XVI: The Inside Story of How the Pope was Elected, and Where He will Take the Catholic Church.

Engineers trying to get the flood water out of New Orleans face many challenges in their task. Communication is a major problem. So is transportation. The Army Corps of Engineers needs to build crude roads just to get workers to the breached sections of the levee system.

Pakistani security officials now say several terrorist operatives were killed in a U.S. airstrike that claimed 18 lives last week. But the attack missed al Qaeda's second-in-command, Ayman al-Zawahri -- and the outcome illustrates the difficulty of tracking down al Qaeda leaders.

As the climate warms, plants bloom earlier in the spring, overlap with other species and could even start growing in new locations. That's bad news for people with pollen allergies.

Three decades ago, the newly independent country of Ukraine was briefly the third-largest nuclear power in the world. A lot has changed since then.

Secretary of State Antony Blinken heads out on an Asia swing this week to reinforce the administration's continued focus on competition with China despite the crisis in Ukraine.