The world's central banks are pumping cash into their economies, pushing down interest rates in hopes the ready cash and lower rates will boost borrowing and economic activity. Everyone agrees the action is dramatic and unprecedented, but there's disagreement over whether they will do more harm than good.

Economists know very well the trillions of dollars being added by the central banks to the global economy can be risky.

"These are risks about long-term rises in inflation, housing bubbles potentially building up," says Jacob Kirkegaard of the Peterson Institute.

NASA's newest Mars rover, Curiosity, has snapped photos of rocky outcroppings that jut out from the alien soil, and scientists say they look like the remnants of an ancient stream bed where water once flowed on the surface of the red planet.

The exposed rocks look like broken slabs of concrete sidewalk, about four inches thick, and are made of rounded bits of gravel in a sandy matrix. The rock has eroded a little bit, and some of the smooth pebbles — about the size of M&M candies — have fallen down into a little pile.

Early in-person voting has begun in Iowa, the first swing state to open polling sites.

Residents of the battleground state can now vote in person at their local county auditors' offices or turn them in by mail. Some areas will offer additional satellite locations.

At the Polk County Auditor's office in downtown Des Moines Thursday morning, a line of voters stretched down the block as the door opened.

Peter Clay, 62, was among the many supporters of President Obama. He says he's volunteered for the campaign on his days off from his job as a zookeeper.

A "large scale Canada-U.S. cheese smuggling operation" has been brought down, after an international investigation tracked criminals who were skirting import duties and Canada's higher cheese prices.

"The investigation revealed over $200,000 worth of cheese and other products were purchased and distributed for an estimated profit of over $165,000," Niagara police said.

A federal judge in Los Angeles has ordered the man behind the anti-Islamic video that is believed to have sparked deadly protests in the Muslim world to be detained.

The Associated Press reports that U.S. Central District Chief Magistrate Judge Suzanne Segal ordered Nakoula Basseley Nakoula held Thursday afternoon. He was deemed a flight risk.

Our original post continues:

New viruses are popping up all over these days – Heartland virus in Missouri last month, a new virus in the same family as SARS in Saudi Arabia this month. And now, a never-before-seen hemorrhagic fever virus in central Africa.