Scott Neuman

The redesigned U.S. $100 bill will begin appearing after October with new security features that will make it "easier for the public to authenticate but more difficult for counterfeiters to replicate," the U.S. Federal Reserve said Wednesday.

Scientists have digitized and analyzed imagery taken by one of the first U.S. weather satellites to create a montage showing the extent of polar sea ice in 1964 so they can compare it to more recent satellite photos.

The arraignment of Boston bombing suspect Dzhokhar Tsarnaev by federal prosecutors in his hospital room is just the beginning of a long and complicated legal path.

As NPR's Carrie Johnson reports, under the charge of using weapons of mass destruction, which is the core of Monday's indictment against Tsarnaev, he is eligible for the death penalty.

U.S. hospitals have been urged to be on the lookout for symptoms of bird flu among patients who have recently traveled to China, where a new strain of the virus has killed 17 people and infected more than 70.

Scientists have unraveled the genome of the coelacanth, a rare and primitive fish once thought to be extinct, shedding light on how closely it's related to the first creatures to emerge from the sea.

The coelacanth, a fish that can reach up to 5 feet long and lives in deep ocean caves, had only been seen in fossils and was thought to have gone extinct some 70 million years ago. That was until 1938, when fishermen from the Comoros islands off the coast of Africa captured one in a net. A second coelacanth species was discovered off the Indonesian island of Sulewesi in 1997.

A bipartisan compromise that would have expanded federal background checks for firearms purchases has been rejected by the Senate.

The defeat of the measure by a 54-46 vote — six votes shy of the number needed to clear the Senate — marks a major setback for gun-control advocates, many of whom had hoped that Congress would act to curb gun violence in the wake of December's Newtown elementary school massacre, where 20 students and six adults were killed.

American Airlines has promised passengers that Wednesday's flight schedule will be nothing like the day before, when thousands were stranded due to a glitch in the reservations system that forced hundreds of flights to be canceled or delayed.

American Airlines and American Eagle scuttled 970 flights and delayed more than 1,000 others Tuesday, The Associated Press said, citing flight-tracking service FlightAware.com.

China on Tuesday detailed the structure of its military force in a special national defense report that also took a swipe at the United States for what it described as stoking tensions in the Asia-Pacific region.

House Budget Committee Chairman Paul Ryan tells NPR that he's "cautiously optimistic" that a budget deal can be reached with the White House.

Speaking to NPR a day after President Obama unveiled a 2014 budget proposal that includes cuts to Social Security and Medicare, as well as tax increases and new investments in education and infrastructure, Ryan said he was encouraged by the broad outlines from the White House.