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Researchers are attempting to treat Alzheimer's disease with antibodies, hormones and gene therapy. But will any lead to a cure? Ronald Petersen, director of the Mayo Alzheimer's Disease Research Center, talks about the latest research, and whether there might someday be a vaccine to protect the aging brain.

And what happened when a guy called in sick so he could play soccer.

The Curiosity rover nailed its dismount, following a complex routine of aerial acrobatics last weekend. Now, after the thrill of the picture-perfect landing, scientists are eager to start the real mission. John Grotzinger, project scientist for the Mars Science Laboratory mission, describes the immediate goals for the Curiosity rover, now in Gale Crater on Mars.

The lawsuit alleges that the Homeland Security secretary has turned the agency into a "frat house."

A former leader of the Muslim Brotherhood occupies Egypt's presidential palace, leaving many of the country's Coptic Christians deeply anxious about their future. A new group calling itself the Christian Brotherhood has emerged, vowing to stand up for the rights of Copts.

Hit it with a hammer or step on it and still slithers along.

The Bahamas men's team has won the 4x400m relay, edging past a surprisingly quick U.S. team to take the gold medal. It was the first gold medal for any male athlete from the Bahamas. The quartet ran a time of 2:56.72, setting a national record. The U.S. set a season best of 2:57.05 to take silver.

The Royal Spanish Academy, considered the authority on the Spanish language, has recently approved the new term "Espanglish." While some applaud the academy for recognizing a language that's been spoken for more than a century, critics say the word's "deformed" definition is insulting.

California hospitals experienced a 10 percent drop in the number of serious infections over the past year, but a number of San Joaquin Valley hospitals…

In new ads, President Obama and Mitt Romney seek to raise doubts about each other's character. Romney accuses the president of being willing to do anything to stay president. Obama's ad accuses Romney of making a "blatantly false" claim.