Smithsonian Institution

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This undated artist rendering provided by the National Air and Space Museum, Smithsonian Institution shows changes to Milestones of Flight Hall at the National Air and Space Museum in Washington. For the first time since its 1976 opening, the Smithsonian's National Air and Space Museum plans to overhaul its central exhibition showing the milestones of flight. The extensive renovation announced Thursday will be carried out over the next two years with portions of the exhibit closing temporarily over time, said Museum Director J.R. "Jack" Dailey. (AP Photo/National Air and Space Museum, Smithsonian Institution)

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This illustration provided by the Smithsonian Institution on March 18, 2014 shows the dinosaur Anzu wyliei. The birdlike animal, about 7 feet tall, weighed an estimated 500 pounds when it roamed western North America around 66-68 million years ago. Nicknamed the "chicken from hell," the creature was formally introduced with an official name to the scientific community Wednesday, March 19, 2104 as scientists published a description and analysis of its anatomy. (AP Photo/Bob Walters)

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FILE - In this Aug. 24, 2010 FILE photo released by Chile's Paleontological Museum of Caldera, a prehistoric whale fossil lays in the Atacama desert near Copiapo, Chile. A team of Chilean and Smithsonian Institution scientists investigating the graveyard of marine mammal fossils say toxins generated by algae blooms most likely poisoned the animals millions of years ago. The study by a team of Chilean and Smithsonian Institution scientists was published Wednesday, Feb. 26, 2014 in the journal Proceedings of the Royal Society B. (AP Photo/Museo Paleontologico de Caldera, File)

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This 1945 handout photo provided by the Smithsonian Institution shows the rescuing of art from Buxheim Monastery, Bavaria, Photographs, maps and records from the real corps of soldiers known as “Monuments Men” who were tasked with protecting European cultural sites and recovering looted art during World War II are going on display in Washington, many for the first time. (AP Photo/Edward E. Adams, Smithsonian Institution)

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This 1945 handout photo provided by the Smithsonian Institution shows the rescuing of art from Buxheim Monastery, Bavaria, Photographs, maps and records from the real corps of soldiers known as “Monuments Men” who were tasked with protecting European cultural sites and recovering looted art during World War II are going on display in Washington, many for the first time. (AP Photo/Edward E. Adams, Smithsonian Institution)

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This handout photo provided by the Smithsonian Institution, taken in Nov. 2008, shows a family viewing the Star Spangled Banner at the Smithsonian's National Museum of American History in Washington. The original, handwritten manuscript of “The Star-Spangled Banner” and the flag that inspired the song’s lyrics will be displayed together at the Smithsonian in Washington, what is believed to be the first time the historic pieces have been shown side-by-side, on Flag Day, June 14, through July 6. (AP Photo/Hugh Talman, Smithsonian Institution)

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** FILE ** This handout photo provided by the Smithsonian Institution, taken in November 2008, shows a family viewing the Star Spangled Banner at the Smithsonian's National Museum of American History in Washington. (AP Photo/Hugh Talman, Smithsonian Institution)

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This undated handout image provided by the Smithsonian Institution shows a three-dimensional rendering of Abraham Lincoln’s life mask, held at the Smithsonian’s National Portrait Gallery. the Smithsonian is launching a new 3D viewer online Wednesday, Nov. 13, 2013, to give people a closer look at artifacts in their own homes. (AP Photo/Smithsonian Institution)