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Every place has its own sound. A small group of scientists is hard at work recording the natural sounds of national parks all across the U.S. — more than 70 soundscapes so far.

For our series on the centennial of the national parks, we traveled to Colorado, to find out how they create these portraits of sound.

First Lesson: It's Very Hard To Escape The Sound Of Humans.

A team of construction workers is pouring concrete onto the frame of a structure that will eventually become a wastewater treatment plant. It's 1 a.m. on a clear night in the suburbs of Phoenix.

The temperature is still in the high 80s. But that's way down from the area's recent record high temperatures, up to 118 degrees.

Around here, it never really gets cool in the summer. That's partly because Phoenix is such a big city that it traps the heat — a heat island.

But now in the middle of the night, it's finally cool enough to start work.

The world's second largest diamond goes on the auction block today for an expected $70 million.

It was found last fall in Botswana, where half the population is poor or hovering just above poverty.

All of which raises the question: How much do diamond sales benefit Botswana's citizens?

Where a hospital is located and who owns it make a big difference in how many of its doctors take meals, consulting and promotional payments from pharmaceutical and medical device companies, a ProPublica analysis shows.

A higher percentage of doctors affiliated with hospitals in the South have received such payments than doctors in other regions of the country, our analysis found. And a greater share of doctors at for-profit hospitals have taken them than at nonprofit and government facilities.

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/.

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:

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

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.

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.

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.

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.

At least 32 people have died at Istanbul's Ataturk International Airport, where an explosion followed an outburst of gunfire Tuesday night, according to Turkish media. Police and emergency personnel have flocked to the airport. More than 80 people were reportedly injured.

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

Two new albums of Puerto Rican music are giving vintage musical styles new meaning in the present. Singer Ileana Cabra and the leaders of the group Miramar all had careers in cutting edge salsa and pop; on their own, though, they've chosen to update older sounds, especially the melancholy, romantic bolero. Their new albums -- Ileana Cabra's iLevitable and Miramar's Dedication to Sylvia Rexach — are both out now.

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