A general view of downtown Oklahoma City as basketball fans gather outside Oklahoma City Arena. The once run-down area has undergone a major transformation over the past 20 years. Ronald Martinez/Getty Images hide caption

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Spectators bow their heads during a moment of silence during a ceremony to commemorate the 20th anniversary of the Oklahoma City bombing at the Oklahoma City National Memorial, on Sunday. Sue Ogrocki/AP hide caption

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Republican presidential hopeful Sen. Ted Cruz speaks at the Republican Leadership Summit Saturday in Nashua, N.H. Jim Cole/AP hide caption

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Chef Homaro Cantu holds a tomato in the kitchen of his Chicago restaurant Moto in 2007. Haute cuisine and extreme science collided in the kitchen of Chef Cantu, who took his own life Tuesday. Jeff Haynes/AFP/Getty Images hide caption

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A shape that could be an airplane is seen in a 3D sonar image (lower portion) of the USS Independence released by NOAA, which located the shipwreck in Monterey Bay National Marine Sanctuary. A team located the carrier during a maritime archaeological survey. NOAA, Boeing, and Coda Octopus hide caption

itoggle caption NOAA, Boeing, and Coda Octopus