Cheese might take on a whole new flavor when you use a plastic utensil. Elizabeth Willing/Courtesy Flavour hide caption

itoggle caption Elizabeth Willing/Courtesy Flavour

Judge Vaughn Walker struck down California's proposition banning gay marriage in 2010. The Supreme Court kept that ruling intact on Wednesday. Elaine Thompson/AP hide caption

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Jay Keasling (left), speaking with Rajit Sapar at the Joint BioEnergy Institute, is pioneering a technique to develop diesel fuel from yeast. Courtesy of Lawrence Berkeley National Laboratory hide caption

itoggle caption Courtesy of Lawrence Berkeley National Laboratory

Global Thermostat's pilot plant in Menlo Park, Calif., pulls carbon dioxide from the surrounding air. The next challenge is to find uses for the captured gas. Courtesy of Global Thermostat hide caption

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Postmaster General Patrick Donahoe, in 2011, appears before a Senate committee looking into the Postal Service's economic troubles. J. Scott Applewhite/AP hide caption

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Supporters of the NAACP hold signs outside the Supreme Court building on Tuesday. The court ruled that Section 4 of the Voting Rights Act, which aimed at protecting minority voters, is unconstitutional. Win McNamee/Getty Images hide caption

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Veetek Witkowski holds a newly assembled AR-15 rifle at the Stag Arms company in New Britain, Conn., in April. Charles Krupa/AP hide caption

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Martin Luther King, Jr. speaks to a crowd in Detroit on June 23, 1963. ASSOCIATED PRESS hide caption

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President Obama meets with speechwriter Jon Favreau in the Oval Office in 2009. Pete Souza/White House via Getty Images hide caption

itoggle caption Pete Souza/White House via Getty Images

In San Jose, Calif., on June 6, President Obama encouraged people to sign up for insurance in the nation's largest health insurance market. Stephen Lam/Getty Images hide caption

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Jim White of Pennsylvania pumps gas at a BP station in Ocala, Fla., in April. The price of gasoline remains stubbornly high, which may put a crimp on summer travel plans. Doug Engle/Ocala Star-Banner / Landov hide caption

itoggle caption Doug Engle/Ocala Star-Banner / Landov

Heather Liljengren, a field taxonomist with the New York City Department of Parks and Recreation, examines the seed pods of the Virginia spiderwort at Oakwood Beach, Staten Island. Liljengren collects seeds from across the region for a seed bank of native plants. Andrea Hsu/NPR hide caption

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A 17-year-old Civil Rights demonstrator is attacked by a police dog in Birmingham, Ala., on May 3, 1963. This image led the front page of the next day's New York Times. Bill Hudson/ASSOCIATED PRESS hide caption

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Instructional assistant Jessica Reeder touches her nose to get Jacob Day, 3, who has autism, to focus his attention on her during a therapy session in April 2007. Rich Pedroncelli/AP hide caption

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Louis Parsons in his late teens, circa 1946, standing beside an Aeronca Champion airplane, a typical trainer plane for aspiring post-war private pilots. Parsons Family Photograph hide caption

itoggle caption Parsons Family Photograph