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Scientists know the omicron variant will cause many breakthrough infections. Given that omicron is now the dominant strain in the U.S., maybe it's time to rethink that booster shot.

Felipe Calderon and Andres Manuel Lopez Obrador both declare victory in Mexico's presidential election. Authorities say an official vote count will not be complete until later in the week. With more than 30 million votes counted, preliminary numbers showed the two men only 300,000 votes apart.

An increasing number of officials and analysts are saying that Medicaid cannot be fixed. Medicaid is the nation's largest health insurance provider for the poor and its budget is straining local and federal governments.

NASA calls off the launch of the Space Shuttle Discovery, citing a faulty fuel sensor. The announcement at Cape Canaveral came less than two and a half hours before the liftoff, scheduled for just before 4 p.m., ET.

The Justice Department will compare U.S. and British anti-terror laws to see if any British tactics should be adopted. Attorney General Alberto Gonzales has expressed interest in the powers held by his U.K. counterparts, including the ability to hold terrorism suspects without charge for up to 28 days. But the U.S. Constitution could doom tougher detention laws. And U.S. officials may already have enough power to effectively pursue terrorists.

A federal trial begins Monday in Harrisburg, Pa., over a Dover school district disclaimer that introduces the idea of "intelligent design" in high school biology classes. It is the first major test of the issue in a federal court.

The lead singer in Ukraine's biggest rock band is one of Ukrainian celebrities who are using their fame and connections to speed relief supplies to those who need them most.

In 1964, the musical made a star out of 21-year-old Barbra Streisand. Now a new version features Beanie Feldstein.

Daily Beast and Newsweek editor Tina Brown highlights a book and an article on two titanic individuals at the center of political change: Russian President-elect Vladimir Putin and pro-democracy activist Aung San Suu Kyi of Myanmar.

These days hospitals drill for mass casualty disasters like the explosions at Monday's Boston Marathon. But when it happened for real, the first response was disbelief. Then the victims began arriving. Doctors say they were confronted with the kinds of IED injuries that U.S. troops have gotten in Iraq and Afghanistan.