National
Friday
This satellite image taken Thursday shows the oil slick in the Gulf of Mexico as it nears the shoreline, threatening wildlife along Louisiana's fragile islands and barrier marshes. NASA/AP hide caption
Veterinarian Diane Febles (left) and her assistant, Tracey McKnight, of Veterinary Equine Dentistry work on a horse in Henry County, Ga. The silver speculum keeps the horse's mouth open and prevents the animal from biting Febles' fingers. Joanne Silberner/NPR hide caption
According to the Congressional Budget Office, annual debt payments — currently about $200 billion — are set to skyrocket. CBO estimates that interest payments on the federal debt will total $916 billion by the year 2020. Jewel Samad/AFP/Getty Images hide caption
A counter-demonstrator squares off with immigrant rights supporters during a protest outside Wrigley Field before the start of the Cubs game against the Arizona Diamondbacks Thursday in Chicago. Dozens of people demonstrated outside the park calling for a boycott of the series to protest the passage of Arizona's controversial immigration law. Scott Olson/Getty Images hide caption
Microsoft chief research and strategy officer Craig Mundie speaks at a 2007 conference. Mundie says Microsoft is preparing for the arrival of new microprocessors, which will power souped-up computers and devices. Courtesy of Microsoft hide caption
Stephen Quake (left) and Euan Ashley review genetic risk factors that Ashley and colleagues found in Quake's genome. Norbert von der Groeben/Stanford School of Medicine hide caption