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Sweet potato evangelist Maria Isabel Andrade drives around Mozambique in her orange Toyota Land Cruiser in 2012. She is one of four researchers honored with the World Food Prize for promoting the crop to combat malnutrition.

How The Humble Orange Sweet Potato Won Researchers The World Food Prize

One summer day in 2012, on a long drive through northern Mozambique, I saw groups of men standing beside the road selling buckets filled with sweet potatoes. My translator and I pulled over to take a closer look. Many of the sweet potatoes, as I'd hoped, were orange inside. In fact, the men had cut off the tips of each root to show off that orange color. It was a selling point.

Aedes aegypti mosquitoes in a lab in Recife, Brazil.

How An Electric Shock Could One Day Protect You From Zika

This summer, it's not just athletes that are looking to set world records. Scientists are also trying to break a record — for how quickly they can make a vaccine for a new virus.

It's for Zika. And one team is leading the pack.

Donald Trump speaks to guests during a policy speech during a campaign stop in Monessen, Pennsylvania on June 28.

Fact Check: Trump's Speech On The Economy Annotated

Donald Trump laid out his plan for the economy, criticizing globalization and policies that promote free trade, in a speech in Monessen, Pa., on Tuesday.

NPR's politics team has annotated Trump's speech. The portions we commented on are bolded, followed by analysis and fact check in italics. We will update further.

The speech follows:

President Obama is interviewed by NPR's Steve Inskeep.

Obama: Trump Hasn't Captured 'Zeitgeist Of The Country'

Donald Trump may have clinched the GOP nomination and commands attention with his unorthodox presidential campaign, but President Obama says Trump's record low favorability ratings show he hasn't won over the hearts and minds of the country just yet.

U.N. Secretary-General Ban Ki-moon (left) and Greenland's then-Prime Minister Aleqa Hammond stand on the ice outside the city of Uummannaq, north of the Arctic Circle, in 2014. Greenland held a referendum in 1982 and voted to leave the European Economic Community, the forerunner of the European Union. Greenland's leaders say they believe it was the right decision.

Britain Won't Be The First To Leave A United Europe. Guess Who Was?

I was in Luxembourg recently, in advance of the British referendum on leaving the European Union, and received a tour, a history lesson and practically a sermon on the merits of the European Union by Heinz-Hermann Elting.

Elting is a German-born resident of Luxembourg City. He's retired now and rides his bicycle around the city when he isn't caring for his sheep — that's singular "sheep." He used to work for the European Parliament, a movable legislative feast that spends a part of the year in Luxembourg.

Shane Altzier sweeps out the mud from the utilities office in Rainelle, W.Va., one of the towns hardest hit by floods that tore through the state on Friday. More rain this week has slowed cleanup efforts.

West Virginians Turn To Federal Government For Help After Devastating Floods

As the water recedes in West Virginia, residents are taking stock of their losses. At least 23 people died in massive floods that swept across the southeastern part of the state on Friday.

Dozens are injured after at least one explosion and gunfire at the Ataturk airport in Istanbul on Tuesday.

Attack At Istanbul's International Airport Kills At Least 28 People

At least 28 people have died at Istanbul's Ataturk International Airport, where an explosion followed an outburst of gunfire Tuesday night, according to Turkish officials. Police and emergency personnel have flocked to the airport. Some 60 people were reportedly injured.

Crucial details about the attack are still emerging. We'll update this post with news from Istanbul as it emerges.

Hillary Clinton speaks at a campaign event in Cincinnati on Monday.

FACT CHECK: Clinton's Speech On The Economy, Annotated

Hillary Clinton laid out her economic plan on Monday at a rally in Cincinnati. She appeared with Sen. Elizabeth Warren, a hero to progressives who has stood up to bank executives and called for lower student debt.

NPR's politics team has annotated Clinton's portion of the speech below. Portions we commented on are in boldface, followed by analysis and fact check in italics.

The speech follows:

Former gubernatorial candidate Zephyr Teachout is one of several female Democratic candidates running in Tuesday's primaries. She is competing against college professor Eric Kingson in New York.

New York, Colorado Hold Key Primaries In Fight For House And Senate

Voters go to the polls in five states on Tuesday, where congressional primaries in New York and Colorado in particular could have an important impact on key competitive House and Senate races.

Democrats hope to contest as many as four congressional seats in the Empire State, a place that could prove critical in whether they're able to flip the 30 they need to win back the House.

Nigel Farage, leader of the UKIP party, sits behind a British flag during a special session of European Parliament in Brussels on Tuesday.

WATCH: Brexiteer Nigel Farage To EU: 'You're Not Laughing Now, Are You?'

Nigel Farage, a member of the European Parliament and the leader of the U.K. Independence Party, spoke on the floor of the European Parliament on Tuesday morning.

It was a special session of the Parliament, called in the wake of the U.K.'s decision to leave the European Union. Farage — whose eurosceptic right-wing party was firmly in favor of the Brexit, and who personally campaigned quite passionately for it — was grinning.

And on a day marked with fiery speeches, his stood out.