Survivors are escorted from the National Bardo Museum in Tunis on Wednesday. At least 20 foreign tourists were reportedly killed in the attack. Mohamed Messara/EPA/Landov hide caption

A sign memorializes the devastating mudslide that killed 43 people in Oso, Wash., one year ago. Ted S. Warren/AP hide caption

Jamal (played by Jussie Smollett) and Cookie (played by Taraji P. Henson) attend the all white party in the "The Lyon's Roar" episode of Empire. Matt Dinnerstein/FOX hide caption

A nurse in 1938 checks the amount of insulin in a needle. For many decades, the only insulin available to people with diabetes came from the pancreases of cattle or pigs. Insulin from animals is still available outside the U.S. — and cheaper than a recombinant DNA version. Bettmann/Corbis hide caption

Models show designs by Oscar de la Renta at the 1973 Versailles show. De la Renta was one of the first American designers to sign on for the catwalk competition. Daniel Simon/Gamma-Rapho via Getty Images hide caption

Lance Cpl. Brittany Dunklee talks with her fellow Marines. David Gilkey/NPR hide caption

The logo of Microsoft's Internet Explorer, the Web browser due to be phased out in the next version of Windows. Damian Dovarganes/AP hide caption

Big Chief Tugga Cloud, 17, leads the Red Flame Hunters, a newer Mardi Gras Indian tribe that is also a youth outreach organization. Eve Troeh/WWNO hide caption

President Obama takes questions from the audience Wednesday after speaking about the economy and the middle class to the City Club of Cleveland. Jacquelyn Martin/AP hide caption

Nearly a third of new auto loans now last 74 months or longer, which alarms some analysts. iStockphoto hide caption

Staghorn coral planted by scientists in the Florida Keys. Researchers hope to give the same sort of boost to the world's shrinking population of pillar coral, now that they can raise the creatures in a laboratory. Joe Berg/Way Down Video/Mote hide caption