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Khizr Khan, the father of an American Muslim captain killed in Iraq, had a message for Donald Trump at the Democratic National Convention Thursday night:

"Have you ever been to Arlington cemetery? Go look at the graves of brave patriots who died defending the United States of America. You will see all faiths, genders and ethnicities. You have sacrificed nothing and no one."

Farmers are watching the election closely, looking at issues like immigration which could affect farm labor. Today, a look at the dangers of farming.

According to the International Labor Organization, nearly half of the 335,000 workplace fatalities around the world every year take place in agriculture settings.

Here & Now‘s Robin Young talks with David Griffiths and his wife Edie, founders of Seven Stars Farm Organic Yogurt, about the hay bale accident that left him quadriplegic.

On the final day of the Democratic National Convention, all eyes are on Hillary Clinton.

The former first lady, senator and secretary of state is expected to accept her party's nomination for president.

Here's what you've missed so far and what's coming up:

The final night of the Democratic National Convention belongs to Hillary Clinton, who will formally accept her party's nomination for president this evening.

She's the first woman to ever be nominated for the White House by a major political party, and she'll be introduced by her daughter, Chelsea, to make her historic acceptance speech.

Many Senate Democratic women will also speak ahead of Clinton's speech.

Singers Carole King, Katy Perry and Sheila E. will also perform.

Here is a partial evening schedule, as provided by the DNC:

If you've been watching the Democratic National Convention in Philadelphia on TV, you've probably seen it happen a few times already: Every few minutes, a fresh wave of brightly colored signs — bearing campaign slogans like "Stronger Together" or "Love Trumps Hate" — spreads across the convention floor like wildfire.

California Gov. Jerry Brown, a Democrat, has been in politics since the 1960s, and launched multiple runs for president himself.

In 1992, he ran as the outsider candidate — chastising the incumbent parties that had "failed their duty."

"They've placed their own interest about the national interest," he said during the speech that kicked off his campaign. They've allowed themselves to be trapped and in some cases corrupted by the powerful forces of greed. It's time for them go!"

Earlier this year, a 6-year-old girl was shot and badly wounded during a firefight between U.S. and Afghan forces and the Taliban. Her father, a Taliban fighter, her mother and some siblings were all killed in the gun battle.

Dr. Chance Henderson, a Texas-born orthopedic surgeon, was there when the girl, whom NPR is calling Ameera, was brought to the hospital at the Bagram Airfield outside Kabul.

"I remember her quite vividly there on that stretcher, and how tiny she looked," he says.

Researchers have found a curious purple orb near California's Channel Islands – and it's left them stumped.

There's been a looming fear that mosquitoes would start spreading the Zika virus in the U.S. Now that possibility seems increasingly real.

On Thursday, senior officials at the Food and Drug Administration said they have asked blood donation centers in two Florida counties, Miami-Dade and Broward, to stop collecting blood for the time being.

Prosecutors moved to drop murder charges against Ingmar Guandique, who was accused of killing 24-year-old Washington, D.C., intern Chandra Levy in 2001. The judge immediately approved and dismissed the case on Thursday.

The Levy case "made headlines across the nation because of the victim's romantic involvement when then-Rep. Gary Condit," as The Two-Way reported.

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Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

At the Democratic National Convention this week, Bernie Sanders announced that his successful rival, Hillary Clinton, had adopted one of his most popular proposals: Free tuition at public colleges.

Immigration is an intricate part of the history of the United States. But in 2012, a new trend appeared: juveniles traveling alone showed up at the border in huge numbers.

President Obama became alarmed, and two years later visited Central America and the border to send a message of deterrence to parents and minors who were planning to make the journey north.

Iranian-Swedish mathematician Sara Zahedi has won a prestigious European Mathematical Society Prize, the top honor for young European mathematicians awarded once every four years.

Zahedi is being recognized for her efforts to improve computer simulations of the behavior of fluids that don't mix together.

"I am the law-and-order candidate."

With that proclamation in his acceptance speech, Donald Trump made it official that he'd be recycling the themes and language of Richard Nixon's 1968 campaign. A lot of observers were quick to point out that 2016 is no 1968 and that Donald Trump is no Richard Nixon. As it happens, "law and order" isn't what it once was, either.

Growing up in South Carolina, soul singer Sharon Jones knew from the first time she sang in her church's Christmas play that she would be a musician.

"I was, like, maybe 8, 9 years old ... and I got to sing 'Silent Night,'" she tells Fresh Air host Terry Gross. Jones remembers audience members taking note of her performance. "Right then and there," she says, "I knew that I was going to be a singer. God had blessed me with a gift."

A bone from a human ancestor that died between 1.8 million and 1.6 million years ago shows evidence of cancer, a newly published study finds. It is the oldest known example of a malignant tumor in a human ancestor.

Flour seems innocuous. We've long been warned to wash our hands after handling chicken, and to cook our hamburgers well. We wash lettuce that came straight from the field. But really, flour?

This week, the Centers for Disease Control and Prevention reminded everyone that flour is, in fact, a raw, uncooked food, just like those fresh greens. Yes, it can make you sick.

Russian and Syria have said they are opening humanitarian corridors out of besieged, rebel-held areas in the northern Syrian city of Aleppo. But NPR has reached civilians in the embattled city who turned back for fear of the ongoing shelling.

In a big hotel conference room near New York's Times Square, six doctors huddle around a greasy piece of raw pork. They watch as addiction medicine specialist Michael Frost delicately marks the meat, incises it and implants four match-sized rods.

"If you can do it well on the pork, you can easily do it on the person," Frost tells his audience.

Democratic vice presidential nominee Sen. Tim Kaine introduced himself to America Wednesday night as a fighter, Hillary Clinton's ally and — a dad. Not just a dad to his own children but everybody's dad.

To start, he doesn't speak like a politician.

"Can I be honest with you about something?" Kaine said, "Can I be honest with you about something? I never expected to be here." He talked about his midwestern upbringing, and his own union father dad.

A day after shocking the political and foreign policy establishments on both sides of the aisle with a call for Russia to hack into Democratic presidential nominee Hillary Clinton's email, Republican nominee Donald Trump now says he was being "sarcastic."

Less than 24 hours earlier, Trump said he would welcome Russian hackers releasing any emails they could "find" from the private email server Clinton used while serving as secretary of state.

Maybe it was a meteor? Or space junk? People on the West Coast weren't sure what the bright object was that streaked across the sky Wednesday night, but they knew it was spectacular. Now comes word that the object — which separated into bright fragments — was a stage of China's large new rocket.

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