Astronaut Janet Kavandi, director of Flight Crew Operations for Johnson Space Center, leads President Barack Obama, First Lady Michelle Obama and daughters Sasha and Malia, as they view the front landing gear of Space Shuttle Atlantis. Saul Loeb/AFP/Getty Images hide caption
The space shuttle Endeavour is seen on launch pad 39a as a storm passes by prior to the rollback of the Rotating Service Structure (RSS), Thursday, April 28, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Bill Ingalls/NASA hide caption
Three-month-old baby bonobo Nakarla plays with its mother Ukela on March 19, 2008 at the zoo in Frankfurt. Thomas Lohnes/AFP/Getty Images hide caption
Kathy Vitzthum. Bob Elbert/Iowa State University hide caption
Radio telescopes of the Allen Telescope Array are seen in Hat Creek, Calif. Ben Margot/AP hide caption
A Remington International, circa 1961. Fox Photos/Getty Images hide caption
Estibalis Chavez paints a portrait of Britain's Prince William and Kate Middleton in front of the British Embassy in Mexico City. Alexandre Meneghini/AP hide caption