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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.

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.

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.

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