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Then-candidate Donald Trump is introduced by then-South Carolina Lt. Gov. Henry McMaster at a campaign rally in Florence, S.C., in 2016. Now Trump is president and McMaster is governor and campaigning for a full term. Sean Rayford/Getty Images hide caption

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Sean Rayford/Getty Images

House Majority Leader Kevin McCarthy, R-Calif., and House Speaker Paul Ryan, R-Wis., continue to try to wrangle votes for a "consensus" immigration bill. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

Supporters of Turkey's President Recep Tayyip Erdogan gather in front of the Huber Presidential Palace, where he delivered a victory speech. Preliminary results indicate Erdogan has avoided a runoff. Chris McGrath/Getty Images hide caption

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Chris McGrath/Getty Images

Diego Luna attends the Hollywood premiere of Rogue One: A Star Wars Story on Dec. 10, 2016. Luna lives in Mexico City and, as a political activist, he sees himself as someone who has a voice on both sides of the border. Charley Gallay/Getty Images for Disney hide caption

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Charley Gallay/Getty Images for Disney

Actor Diego Luna On The 'Awakening' Around Mexico's Presidential Election

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Albino Quiroz Sandoval is seen at age 10 (bottom right) with relatives including his parents and brother. Now in his 70s, he has been missing for more than a year. Alejandra Rajal for NPR hide caption

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Alejandra Rajal for NPR

Last Year, A Retired Mexican Schoolteacher Vanished. His Family Still Seeks Answers

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Harley-Davidson motorcycle engines are assembled at the company's plant in Menomonee Falls, Wis. Tariffs from the European Union are prompting the company to shift production of some motorcycles for the European market overseas. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

If you are bitten by a Lone Star tick, you could develop an unusual allergy to red meat. And as this tick's territory spreads beyond the Southeast, the allergy seems to be spreading with it. Robert Noonan/Science Source hide caption

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Robert Noonan/Science Source

Red Meat Allergies Caused By Tick Bites Are On The Rise

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A vaccine given during pregnancy protects the baby against whooping cough, but only about 50 percent of pregnant women get it. Nicole Xu for NPR hide caption

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Nicole Xu for NPR

Pregnant Women: Avoid Soft Cheeses, But Do Get These Shots

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Children and workers are seen at a tent encampment on June 19, 2018 in Tornillo, Texas. The Trump administration is using the tent facility to house immigrant children separated from their parents. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

The owner of The Red Hen in Lexington, Va., asked White House press secretary Sarah Sanders was asked to leave Saturday night. It is not the first time politics has played a role in Trump aides' public dinner plans. Daniel Lin/AP hide caption

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Daniel Lin/AP

Dr. Vinay Prasad is 35 and an assistant professor of medicine at Oregon Health and Science University in Portland, where he researches health policy, the high cost of drugs and evidence-based medicine. He has more than 21,000 followers on Twitter. Marvin Joseph/The Washington Post via Getty Images hide caption

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Marvin Joseph/The Washington Post via Getty Images

Tweeting Oncologist Draws Ire And Admiration For Calling Out Hype

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Donald Trump greets a crowd, including many younger supporters, after delivering his acceptance speech at the New York Hilton Midtown on election night 2016. Many younger voters have left the GOP since Trump took office. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Beavers are known as "ecosystem engineers," species that make precise and transformative changes to their lived environment. Larry Smith/Flickr hide caption

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Larry Smith/Flickr

The Bountiful Benefits Of Bringing Back The Beavers

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Thousands of Ethiopian Prime Minister Abiy Ahmed's supporters gathered to watch him speak at a rally Saturday in Addis Ababa. But a blast interrupted the event, leaving at least one person dead and dozens more with injuries. Yonas Tadesse/AFP/Getty Images hide caption

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Yonas Tadesse/AFP/Getty Images

A photo of President Trump and North Korean leader Kim Jong Un is on display as a member of People's Democratic Party stands in opposition of military exercises between the United States and South Korea near the U.S. embassy in Seoul on Tuesday. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

A gas flare is seen at a natural gas processing facility near Williston, N.D. in 2015. A new study says the amount of methane leaking is more than government estimates. Matthew Brown/AP hide caption

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Matthew Brown/AP

Large Methane Leaks Threaten Perception Of 'Clean' Natural Gas

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