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Pledging "to seek a new beginning between the United States and Muslims," President Obama reached out to the world's 1.5 billion followers of Islam Thursday, addressing an appreciative crowd at Cairo University.

Scientists constructed a beating rat heart in the lab. They used a scaffolding of tissue created from a rat cadaver. Then, living heart cells were added and given a jolt.

American reporter Jill Carroll is released unharmed in Iraq, three months after she was kidnapped. "I was treated well, but I don't know why I was kidnapped," Carroll said in an interview on Baghdad television. Her captors had demanded that female detainees be freed or Carroll would be killed.

President George Bush applauds the United Arab Emirates' progress toward democracy. But evidence of Arab resentment toward the president — who is both deeply unpopular and a vital ally — is visible all over the region.

Steven Kotler, author of West of Jesus, tells the story of how surfing saved his life. Kotler talks about overcoming Lyme disease, and his global quest to unravel the mysteries of the "Conductor".

After publishing an article by a proponent of intelligent design, scientist Richard Sternberg found himself the target of retaliation at the Smithsonian Institution. His case is probably the best-documented battle in the war between the vast majority of scientists and a tiny insurgency promoting an alternative to evolution.

In recent years, some lawmakers and gun control groups have pushed for a national database that would record the ballistics signature of every gun sold in the United States. But a new report from the National Research Council says the database would return too many potential matches to be practical.

An international panel has unanimously recommended that Pluto retain its title as a planet, and it may be joined by other undersized objects that revolve around the sun.

New research suggests that icebergs may serve as "hotspots" for ocean life. San Diego scientists are part of a team that studied the floating ice islands in the Antarctic. The icebergs may also help f

How will stability and peace be achieved in the Middle East? We'll talk with Israel's ambassador to the UN about her country's role in the region.