After President Obama overturned Bush-era policy restricting federal funding of embryonic stem cell research in 2009, Nebraska Right to Life led a protest of the research outside the University of Nebraska regents' meeting.
This map, from the United States Geological Survey, shows the age of bedrock in different regions of North America. Scientists found ancient water in bedrock north of Lake Superior. This region, colored red, was formed more than 2.5 billion years ago.
Mars, seen in this composite image, has a lot of water in its polar ice caps. If water is also trapped in the planet's crust, experts say, it could house microbial life.
Scientists have discovered water that has been trapped in rock for more than a billion years. The water might contain microbes that evolved independently from the surface world, and it's a finding that gives new hope to the search for life on other planets.
The water samples came from holes drilled by gold miners near the small town of Timmins, Ontario, about 350 miles north of Toronto. Deep in the Canadian bedrock, miners drill holes and collect samples. Sometimes they hit pay dirt; sometimes they hit water, which seeps out from tiny crevices in the rock.
Afghan and U.S. officials attend the closing ceremony for the Paktia provincial reconstruction team on April 9 in eastern Afghanistan. NATO created more than 20 teams to help the Afghans rebuild. But now the U.S. teams are winding down their activities.
Credit Sean Carberry / NPR
The main road through the Panjshir Valley, shown here April 9, remains under construction. A U.S. reconstruction team started the project in northern Afghanistan, and the provincial government is overseeing the completion.
Credit Sean Carberry / NPR
Lt. Col. John Chong (left), the last commander of the Paktia PRT, rolls up and cases the flag at the closing ceremony on April 9.
On a sunny spring day in eastern Afghanistan's Paktia province, Afghan officials and U.S. troops and civilians gather inside the ancient mud fort in the center of Forward Operating Base Gardez. They're attending a ceremony marking the formal end of the work of the provincial reconstruction team, or PRT.
President Obama announced late Wednesday that the acting commissioner of the Internal Revenue Service, Steve Miller, has resigned in the wake of a report that employees at the agency engaged in partisan scrutiny of conservative groups seeking tax-exempt status.
The president, appearing for a brief statement at the White House, said he had directed Treasury Secretary Jack Lew "to accept the resignation of the acting commissioner of the IRS."