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New research suggests that by the time an Alzheimer's patient is diagnosed, many key neurons are already dead. Neuroscientists say it's possible that several recent trials of drugs for Alzheimer's have failed because the drugs were given after symptoms had already started to appear.

A man has been arrested in an alleged terror plot to blow up the Federal Reserve building in New York City. Federal authorities and the New York Police Department collaborated to foil the plot apparently conceived by a Bangladeshi man, Quazi Mohammd Rezwanul Ahsan Nafis. Nafis is said to have conceived the plot. However, authorities learned of the plot and actually provided what appeared to be the bomb. It was inert and there was no threat to the public.

"I certainly feel a strong call of public service," she tells the BBC, after not ruling out a run for office someday. Now 32, she adds that her mother's run for the White House in 2008 got her thinking about a possible future in politics for herself.

Stymied by Congress early on in his term while trying to advance his climate policies, President Obama has resorted to taking incremental actions that don't need congressional approval. Mitt Romney doesn't mention climate change in his energy plan, and favors cheap energy sources like coal.

The world-renowned orchestra is revitalized with the addition of 37-year-old music director Yannick Nézet-Séguin. He brings a youthful energy to the organization, which is just coming out of bankruptcy.

The race for the state's open U.S. Senate seat has been dominated by three things: an independent former governor, third-party spending and a barrage of negative television ads. Among the casualties of the campaign have been the candidates' positions on the issues.

Armstrong announced Wednesday that he will no longer be chairing Livestrong, the foundation he started to support fellow cancer survivors. And, he lost major sponsors, including Nike, Anheuser-Busch and Radio Shack. All this follows last week's searing report by the U.S. Anti Doping Agency. It placed Armstrong at the center of a sophisticated doping program on his championship cycling teams.

Two-thirds of graduates left college last year with student loans hanging over their heads. The average amount they owed was $26,600, up 5 percent from the previous year. Nearly 9 percent of the graduates were unemployed and 19.1 percent were working part time or had given up looking for a job.

The files give the public a first glance at how the Boy Scouts of America handled allegations of sexual abuse. In some cases, they show that alleged child molesters were able to sneak back into the Scouts; in other cases, they show the Scouts neglected to refer allegations of abuse to law enforcement authorities.

His rise in the polls has been accompanied by a shift to the middle that conservatives had long feared. But because Romney triumphed in direct debate with President Obama, the right is embracing him like never before. Says one conservative leader: "They really get the feeling their guy can win."