Volunteers packed into a room during a petition-drive training session in Cairo. Mohamed ElBaradei's National Association for Change movement has gathered 900,000 signatures on a petition to amend the constitution and end the stranglehold President Hosni Mubarak's ruling party has over elections.
Holly Pickett for NPR
Four of the seven lion cubs (Panthera leo) recently born at the National Zoo in Washington, D.C. Lions boast a special form of sister and brotherly alliance: sisters stay together all their lives in prides, and brothers form coalitions to conquer other prides.
Mehgan Murphy/Smithsonian Institution