President Obama walks with White House Chief of Staff Jack Lew on March 2 on the South Lawn of the White House. Mandel Ngan/AFP/Getty Images hide caption

Charlotte Douglas International Airport has deployed an army of 1.9 million worms to eat through its organic waste. The airport has reduced the trash it sends to the landfill by 70 percent. Julie Rose hide caption

David Thweatt, the school superintendent in Harrold, Texas, is seen in 2008. Troubled by school shootings around the country, Thweatt decided to arm school staff. Tony Gutierrez/AP hide caption

An employee tidies boxes of medicines displayed in a pharmacy in the city of Caen in western France last month. Beginning in 2013, girls between the ages of 15 and 18 will be able to get birth control free of charge, and without parental notification. Charly Triballeau/AFP/Getty Images hide caption

Toby Ord, founder of Giving What We Can. Giving What We Can hide caption

Dr. Aun Pyae Phyo examines a baby at the Whampa malaria clinic on the Thailand-Myanmar border. Ben de la Cruz/NPR hide caption

Indian women and children in New Delhi stage a protest Tuesday to condemn the gang rape of a 23-year-old student on a city bus. Anindito Mukherjee/EPA/Landov hide caption

Instagram was the target of a storm of outrage on Twitter and other sites after the company announced a change in its user agreement that hinted that it might use shared photos in ads. Karly Domb Sadof/AP hide caption

Lou Nasti runs a factory in Brooklyn that makes animatronic Christmas displays. He's been at it for almost 44 years. Neda Ulaby/NPR hide caption