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Kurt Britz checks a driver's license at the 3-D Denver Discrete Dispensary on January 1, 2014, the first day recreational marijuana sales were legal in Colorado. Possession remains illegal for those under 21 years old, and statistics show a widening racial gap in arrests for those offenses.

As Adults Legally Smoke Pot In Colorado, More Minority Kids Arrested For It

Marijuana is legal in Colorado — as long as you're 21 or older. It's still illegal for kids to possess, so juveniles are coming to dominate the marijuana arrests in Colorado. But another startling trend also has developed: Arrest rates have risen dramatically for young blacks and Latinos.

Ricky Montoya isn't surprised that's happening. He's standing outside Courtroom 4F in Denver's City and County Building, where he was just ordered to pay a $1,000 fine for his third marijuana possession offense.

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 who 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 gives a policy speech during a campaign stop in Monessen, Pa., on Tuesday.

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:

Traders at work at ETX Capital work in central London on Monday. Financial markets in the U.K. and around the world have been in turmoil since the Brexit vote last week.

Brexit Makes Investors Nervous, But U.K. Recession Isn't Certain

Last week's Brexit vote sent financial markets tumbling around the world, wiping out months of stock market gains and pushing the British pound down to levels not seen in more than three decades.

It also raised tough questions about the future of the United Kingdom's economy, especially with the resignation of Prime Minister David Cameron and the ensuing political turmoil.

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.

People wait outside the Ataturk airport in Istanbul, where dozens have died in an attack on Tuesday.

Attack At Istanbul's International Airport Kills More Than 30 People

At least 36 people died in an attack on Istanbul's Ataturk International Airport Tuesday night, according to Turkish Prime Minister Binali Yildirim. More than 140 people were injured in the attack, in which at least one explosion followed an outburst of gunfire.

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:

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