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Treatment for Alzheimer's probably needs to begin years or even decades before symptoms of the disease start to appear, scientists reported at this week's Society for Neuroscience meeting in New Orleans.

"By the time an Alzheimer's patient is diagnosed even with mild or moderate Alzheimer's there is very, very extensive neuron death," said John Morrison of Mount Sinai Medical School in New York. "And the neurons that die are precisely those neurons that allow you to navigate the world and make sense of the world."

It is now clear that we are living in a world of viral memes that take no sides when it comes to spoofing politicians or debate moderators.

So what's a politician to do as the target of a social media parody?

Run with it.

"By kind of winking along with the electorate, you're humanizing, personalizing yourself, authenticating yourself," says Rory O'Connor, author of Friends, Followers and the Future. O'Connor argues that social media will be critical to deciding who is elected as the next president.

Just days after Rev. Billy Graham endorsed Republican presidential nominee Mitt Romney's bid for the White House, the website of the Billy Graham Evangelistic Association has stopped overtly listing the candidate's religion among what it says are "cults."

Manssor Arbabsiar, an Iranian-born naturalized American citizen, has pleaded guilty to conspiring with Iranian military officials in a plot to kill the Saudi ambassador to the United States, the Justice Department says.

"Quazi Mohammad Rezwanul Ahsan Nafis, 21, was arrested this morning in downtown Manhattan after he allegedly attempted to detonate what he believed to be a 1,000-pound bomb at the New York Federal Reserve Bank on Liberty Street in lower Manhattan's financial district," the FBI confirms an email just sent to reporters.

It adds that:

Think you're part of the food-literati? True or false: 13 million more acres of farmland would be required to produce enough fruit and vegetables for the daily diets of all Americans to meet U.S. Department of Agriculture nutrition guidelines.

Accidental falls are one of the leading causes of injury death in people over 65 worldwide, but for a long time researchers have struggled to understand just how they happen.