News From NPR

President Obama's time in office has not been defined by terrorism as President George W. Bush's was. Yet incidents like the one in Boston have been a regular, painful through line of his presidency.

When a new administration walks into the White House, nobody provides a handbook on how to respond to a terrorist attack. So the Obama administration has been on a steady learning curve.

Black and Latino homebuyers pay more for housing than whites and Asians, according to a study released this week by Duke University. The price difference is about 3.5 percent.

That may not sound like a lot. But Patrick Bayer, a Duke economics professor who led the study, says when you do the math, that percentage can translate to about $5,000 or $10,000 per housing sale.

(Andy Carvin, NPR's senior strategist for social media, sends us this dispatch about a Twitter account that may hold clues in understanding the surviving Boston bombing suspect.)

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.