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German Theodor Haensch and Americans John Hall and Roy Glauber win the Nobel Prize in Physics for their research on the physics of light. Their work with lasers has helped redefine how distance is measured and allowed physicists to measure the atom's internal structure with new precision.

President Bush says the new energy bill won't bring down gasoline prices right away but would make a contribution to long-term energy independence. The president interrupted his vacation in Texas to visit the Sandia laboratory near Albuquerque, N.M., where he signed the bill into law.

Lee Raymond will step down as Mobil-Exxon's chairman and chief executive officer at the end of this year. He has been at Exxon for 42 years and oversaw the 1999 merger with Mobil.

Nearly two weeks after Hurricane Katrina struck the Gulf Coast, there is no clear idea of the death toll. An emergency official said Saturday that earlier fears of as many as 10,000 deaths will likely prove wrong. But the process of collecting, identifying and counting bodies is a slow one.

President Bush will address the nation Thursday evening from Louisiana, where he will be monitoring Hurricane Katrina recovery efforts, the White House announced Tuesday.

Mike Heidingsfield spent 13 months in Iraq as the top civilian commander in charge of training Iraqi police. He tells Linda Werteimer that Iraqi police are now a more visible presence, but that makes them targets for insurgents, too.

Three weeks after Hurricane Katrina, New Orleans officially welcomes back its first residents. The Algiers area is the first to open. But some officials think it's too soon because of contaminated water and lack of utilities, among other problems.

Researchers are suggesting that flawed construction -- not storm surges -- likely caused key floodwalls around New Orleans to fail. They say the waters of Lake Pontchartrain never got high enough to rise above the walls and erode their foundations, the early explanation for the levee collapses.

Hurricane Rita gains strength as it moves across the Gulf of Mexico on a path toward Texas, prompting mandatory evacuation orders for much of the Texas coast. But its path may mean New Orleans experiences only rain and wind. Even so, the city continues its evacuation.

A suicide car bomber attacks a three-car U.S. diplomatic convoy in the northern Iraqi city of Mosul, killing four Americans. And in Basra, British troops are clashing with Iraqi militias.