Traders work on the floor of the New York Stock Exchange in April. The country's credit rating could suffer if Congress fails to address the nation's long-term debt. Spencer Platt/Getty Images hide caption
Pakistani boys attend the rehabilitation school Sabaoon in Malakand, adjacent to Pakistan's Swat Valley, in July 2010. Anjum Naveed/AP hide caption
Security expert Markus Jakobsson says the best password could be as simple as combining words from a story that only you know. iStockphoto.com hide caption
Anders Behring Breivik (left) exited an Oslo courthouse in an armored police vehicle following a hearing Monday at which he pleaded not guilty to one of the deadliest modern mass killings in peacetime. Jon-Are Berg-Jacobsen/AP hide caption
Patrick Lundvick, 19, dropped out, spent time in jail and is now getting a second chance in South Chicago. Claudio Sanchez/NPR hide caption
What if the spacecrafts from the television program Star Trek: Deep Space Nine were piloted by the operating system Windows 7? Paramount Pictures/Photofest hide caption
From left, Greek Prime Minister George Papandreou, European Council President Herman Van Rompuy and European Commission President Jose Manuel Barroso participate in a media conference after an EU summit of eurogroup members at the EU Council building in Brussels on July 21, 2011. Eurozone leaders agreed on a second bailout package for Greece. Virginia Mayo/Associated Press hide caption
From left, Greek Prime Minister George Papandreou, European Council President Herman Van Rompuy and European Commission President Jose Manuel Barroso participate in a news conference after eurozone leaders agreed on a second bailout package for Greece. Virginia Mayo/Associated Press hide caption
A Somali refugee woman carries a bag of food aid at the entrance to the registration area of the Dadaab refugee settlement in Kenya. While refugees receive international humanitarian aid, local Kenyans fighting drought get sacks of rice, beans and oil from the government. Oli Scarff/Getty Images hide caption
Hiroaki Aikawa and his son, Taiji, mourn the death of Hiroaki's wife, in Kevin Macdonald's Life in a Day, produced by Scott Free UK. Scott Free UK hide caption
Americans for Tax Reform President Grover Norquist jokes as he is introduced before addressing the Conservative Political Action Conference (CPAC) in Washington on Feb. 19, 2010, Cliff Owen/AP hide caption
As warming temperatures drive polar bears south, they're starting to mix with brown bears much the way they did thousands of years ago. iStockphoto.com hide caption
This is what a woolly mammoth looked like — the 10,000-year-old head was found, preserved in ice in the Siberian tundra near the Russian town of Yakutsk in this photo from 2003. Naoki Suzuki/AP hide caption
Jazia Pratt fills a bucket with water from a fire hydrant in the afternoon summer heat in Philadelphia. Matt Rourke/AP hide caption
Zac and Penny Johnson's son Henry is 4, but they still have his hospital blanket in a box with other keepsakes. Zac remembers bringing one of these blankets home to their dog Daisy to smell, in anticipation of Henry's homecoming. Andrea Hsu/NPR hide caption
Illegal immigrants from Guatemala are body searched before boarding a deportation flight on June 24, 2011 in Mesa, Arizona. Each month the U.S. Immigration and Customs Enforcement agency sends thousands of undocumented immigrants back to Guatemala. Many have been caught by in the Secure Communities data-sharing program. John Moore/Getty Images hide caption