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Amyloid plaques and tangles of protein in the brain are two of the key signs of the form of dementia known as Alzheimer's disease. In new work reported in the journal PLOS One, researchers tracked the spread of tangles of tau protein from neuron to neuron in the brains of mice. Study co-author Karen Duff of the Columbia University Medical Center discusses the findings.

NASA's iconic images of Earth from space date back to the late 1960s--with snapshots taken by Apollo astronauts. The modern "blue marble" images are captured by machines and they're not photos. They're datasets collected by instruments aboard satellites and then translated into imagery on the ground.

A day that began with the Anonymous hackers posting a 17-minute recording of a call between officials of the FBI and Scotland Yard has been followed with some tweeted taunting and the hacking of websites for the Greek government and Boston Police.

In the Ukraine the death toll from frigid temperatures climbed to 101.

The Dow registered its highest reading in close to four years.

While hotels along the Vegas Strip are full of Super Bowl fans and convention attendees this weekend, another event will be playing out Saturday at more than 100 locations across the state. Nevada's Republican presidential caucuses will be taking place, and mostly in low-key places.

A federal prosecutor said the case had been closed, but gave no details as to why.

The upcoming 30th anniversary of the Falklands war has heightened tensions between the two countries.

Tom Brady will lead the New England Patriots into Super Bowl 46 in Indianapolis on Sunday. He's already won the Super Bowl three times before. Standing in the way of yet another Patriots victory are Eli Manning and the New York Giants. But a debate is raging over whether Manning belongs among the elite in the game.

Though most people will never attend a single Super Bowl, there are three men who have seen them all. Don Crisman and Larry Jacobson are part of a group that calls itself the "Never Missed a Super Bowl Club," and they have no plans to end the streak any time soon. Guest host David Greene catches up with them as they prepare for Sunday's game in Indianapolis.