After a Cologuard screening test for colon cancer comes back positive, patients may have to pay for additional diagnostic tests. Exact Sciences hide caption

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Sen. John McCain, R-Ariz., and Sen. Marco Rubio, R-Fla., talk on Capitol Hill in 2014. Both are expected to win their primaries for reelection Tuesday. Carolyn Kaster/AP hide caption

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Incumbents Poised For Big Wins Despite All The Attention On Outsiders

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Alexander Litvinenko, a former Russian security agent, died in 2006 after drinking tea laced with the radioactive element polonium-210 at a London hotel. A British inquiry found that his death was the work of the Russian security service. Natasja Weitsz/Getty Images hide caption

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The Curious Deaths Of Kremlin Critics

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Surfers And Scientists Team Up To Create The 'Perfect Wave'

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Single-belled baritones and euphoniums line the ceiling of the V&E Simonetti Historic Tuba Collection to make room the bigger instruments on the floor and walls. Aiyana Simonetti-Poe/Courtesy of V & E Simonetti Historic Tuba Collection hide caption

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A Museum With Nearly 300 Brass Horns: You've Gotta See It Tuba-lieve It

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Groups Worry About Impact Of Police Moves To Block Social Media

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A New School Year Brings Renewed Focus On Attendance

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Pastor Mark Burns spoke at the Republican National Convention last month, calling on Republicans to "come together to defeat Hillary Clinton and those race-baiting Democrats." Chip Somodevilla/Getty Images hide caption

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Actor Gene Wilder as Willy Wonka in Willy Wonka & The Chocolate Factory in 1971. Wilder died Monday at 83. Silver Screen Collection/Hulton Archive/Getty Images hide caption

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Gene Wilder's Nephew On The Actor's Comedic Talent And Alzheimer's Diagnosis

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Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue. Biophoto Associates/Science Source hide caption

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Your Gut's Gone Viral, And That Might Be Good For Your Health

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The scene of a multivehicle pileup in Louisiana three years ago. National traffic safety officials say more than 35,000 people died on the nation's roads and highways last year, a 7.2 percent increase over the previous year. Gerald Herbert/AP hide caption

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Displaced women at the Muna informal settlement outside Maiduguri. They're among more than 2 million people driven from their homes by Boko Haram attacks during northeastern Nigeria's 7-year insurgency. Ofeibea Quist Arcton/NPR hide caption

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Officials found the toxin microcystin in the blue-green algae present at Discovery Bay, Calif. For people exposed to the toxin, symptoms include dizziness, rashes, fever, vomiting and in more unusual cases, numbness. Lesley McClurg/KQED hide caption

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Poisonous Algae Blooms Threaten People, Ecosystems Across U.S.

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U.S. Vice President Joe Biden and Turkish Prime Minister Binali Yildirim hold a news conference after meeting Aug. 24 in Ankara, Turkey. While the U.S. and Turkey are close allies, they've been at odds on a number of issues, and the meeting was designed to improve the atmosphere. Adem Altan/AFP/Getty Images hide caption

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In A Time Of Middle East Conflict, What's The Role Of U.S. Diplomacy?

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The original (P)irate Joe's was once a Romanian bakery. Then it became "Transilvania Trading," the mysteriously labeled storefront where Mike Hallatt sold Trader Joe's items to people who were in on the secret. After Trader Joe's started objecting, Hallatt rebranded as Pirate Joe's. _irate Joe's hide caption

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Thomas Edison (from left), Luther Burbank and Henry Ford. Two are still world-famous; the guy in the middle brought us many crop experiments, including the Himalayan blackberry that's now inescapable in Seattle. New York Botanical Garden/LuEsther T. Mertz Library/Biodiversity Heritage Library hide caption

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Officials from the Norwegian Nature Inspectorate discovered hundreds of dead reindeer on a mountain plateau after a lightning storm. Havard Kjontvedt/Norwegian Nature Inspectorate hide caption

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