NPR News

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.

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.

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