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An electronic circuit begins to dissolve.

Medical Electronics Built To Last Only A Little While

Using silicon, magnesium and a special type of silk, scientists have created electronic circuits that dissolve in liquid. Electronics like these could be useful in future implantable medical devices.

<strong>Curiosity, 2012:</strong> NASA says that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity. For comparison, the agency released an image of rocks from the Earth (right).

Streams Of Water Once Flowed On Mars; NASA Says Photos Prove It

NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars. NASA scientists say that new photos from the rover show rocks that were smoothed and rounded by water.

American Airlines planes sit on the tarmac at Miami International Airport this month. Reports indicate that American Airlines has canceled somewhere between 2 and 5 percent of flights in recent days, reportedly blaming a surge in pilot sick days and maintenance write-ups by pilots.

American Airlines Fliers Fed Up As Labor Clash Rages

It hasn't exactly been a barrel of fun flying American Airlines lately. The carrier, which is in bankruptcy, is in a bitter contract dispute with its pilots union. Its on-time performance has plummeted while cancellations are way up. Meanwhile, some of American's best customers are rethinking their loyalty.

Old Joe (Bruce Willis) and his younger self (Joseph Gordon-Levitt), two iterations of the same assassin, play a particularly personal game of cat and mouse in the time-travel thriller <em>Looper.</em>

'Looper': Time-Travel Nonsense, Winningly Played

Rian Johnson's action-thriller can't dodge the frustrating elements of most time-travel tales, but the film's characters, performances and stylization add up to an experience that critic David Edelstein believes is the right amount of happy and tragic.

Romney Talks Economy, Military Cuts In Virginia

Republican presidential nominee Mitt Romney campaigned with veterans in Northern Virginia on Thursday. And like President Obama, he was in territory that voted for the opposite party four years ago.

Netanyahu Renews Calls For 'Clear Red Line' On Iran

Israel's Prime Minister Benjamin Netanyahu and Palestinian leader Mahmoud Abbas addressed the UN General Assembly on Thursday. Netanyahu called for clear red lines on Iran. Abbas accused Israel of carrying out terrorist attacks by destroying settlements in the West Bank.

Kansas farmer Luke Ulrich pilots his combine through the last eight rows of this year's ragged crop, which produced far less than half the normal yield.

Despite Record Drought, Farmers Expect Banner Year

After the Midwest's driest summer in decades, farmers are assessing their losses and gains. Despite the hit many farms took, the Agriculture Department predicts record high farm income this year, thanks to higher prices and federally subsidized crop insurance.

Mitt Romney speaks Thursday at American Legion Post 176 in Springfield, Va.

A Second, Chance Interview With Subject Of Controversial First Lady Remarks

NPR's Ari Shapiro has the unexpected chance to let an interview subject clarify remarks recorded weeks ago and several states away.

Disease Detectives Catch Deadly African Virus Just As It Emerges

So far only three people in the Democratic Republic of Congo are known to have contracted Bas-Congo hemorrhagic fever, two of whom died. But the small number means that scientists may have found an emerging disease very soon after it made its jump from whatever species it came from into humans.

In 1980s Romney Video From His Bain Days, Profits, Not Jobs, Were Focus

The newly unearthed video of Mitt Romney in 1985 explaining how Bain Capital hoped to "harvest" the firms it invested in seemed at odds with the Republican presidential nominee's suggestion on the campaign trail that creating jobs was a major aim in those days.

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