The U.S. Environmental Protection Agency could soon issue a final ruling that aims to force oil companies to replace E10, gasoline mixed with 10 percent ethanol, with E15.
This move could come just as widespread support for ethanol, which is made from corn, appears to be eroding.
Mike Mitchell was once a true believer in ethanol as a homegrown solution to foreign oil imports. He owns gas stations, and he went further than most, installing expensive blender pumps that let customers choose E15, E20 and all the way up to E85.
When Melissa McCann (left) suffered a stroke in 2007, her twin sister, Terry Blanchard, helped her make a full recovery. McCann is now back to work as a flight nurse with Life Flight at the Eastern Maine Medical Center in Bangor.
Credit David Wright/Redux Pictures for NPR
Doctors think an abnormal hole between the two upper chambers of McCann's heart allowed a blood clot to move to her brain and cause her stroke.
Most people (including a lot of doctors) think of a stroke as something that happens to old people. But the rate is increasing among those in their 50s, 40s and even younger.
In one recent 10-year period, the rate of strokes in Americans younger than 55 went up 84 percent among whites and 54 percent among blacks. One in 5 strokes now occurs in adults 20 to 55 years old — up from 1 in 8 in the mid-1990s.
We've heard many claims in the past decade — and much debate — about the role of vitamin D in the prevention and treatment of conditions as varied as brittle bones, heart disease, cancer, diabetes and dementia.
Pakistani men who worked for the Taliban attend a class at Mishal, an army-run rehabilitation center in Pakistan's Swat Valley, on July 5, 2011. This and similar centers are trying to re-educate men taken in by the Taliban, who ruled Swat before the military drove out the insurgents in 2009.
Credit Farooq Naeem / AFP/Getty Images
Classes such as this one at the Mishal center in Swat on July 5, 2011, teach former jihadis skills that will help them return to their families and be productive members of society.
Credit A. Majeed / AFP/Getty Images
Schoolgirls pray for Pakistan's child activist Malala Yousafzai in Mingora in Pakistan's northwestern Swat Valley on Nov. 10. The teenager was shot by the Taliban for promoting girls' education.
Credit Dina Temple-Raston / NPR
Sabaoon, another center for re-educating former militant recruits, was held by the Taliban before the Pakistan army took it over during the offensive to clear the Taliban from Swat.
More than 100 years ago, Golgi staining on nerve cells opened the gates to modern neuroscience. Scientists recently developed the Technicolor version of Golgi staining, Brainbow, allowing more detailed reconstructions of brain circuits.
Credit AFP/Getty Images
With a combination of genetic tricks and fancy proteins, researchers have colorfully labelled hundreds of individual neurons with distinctive hues to create a "Brainbow."
During the State of the Union, President Obama said the nation is about to embark on an ambitious project: to examine the human brain and create a road map to the trillions of connections that make it work.
"Every dollar we invested to map the human genome returned $140 to our economy — every dollar," the president said. "Today, our scientists are mapping the human brain to unlock the answers to Alzheimer's."