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Nearly 20 kids went back to high school Monday after a very special weekend: They danced onstage with Pharrell at the Oscars Sunday night. It's the fourth time students of Los Angeles' Academy of Music at Hamilton High School have teamed up with the superstar musician in recent months.

"It was a dream. It was awesome," Alexa Baruch, 15, tells member station KPCC. "Leonardo DiCaprio was right in front of us."

The students were chosen to help Pharrell perform his song "Happy," from the soundtrack for the animated film Despicable Me 2. The song hit No. 1 on Billboard's Hot 100 list last week.

"It was a very long process, but very worth it," junior Preston Parker tells KPCC's Mary Plummer of working with Pharrell along with his classmates from the school's dance and chorus programs. "It was crazy incredible. It was a true blessing."

The only thing better, Parker said, would be "to actually win an Oscar."

These days you can fly to far corners of the world and eat the pretty much the same food as you could back home. There's pizza in China and sushi in Ethiopia.

A new scientific study shows that something similar is true of the crops that farmers grow. Increasingly, there's a standard global diet, and the human race is depending more and more on a handful of major crops for much of its food.

At the same time, all over the world, people are eating a bigger variety of foods. But until now, no one had crunched the numbers to see whether global diets were overall getting less diverse, or more.

"We wanted to know, really, how many crops feed the world, and what's happening with them," says Colin Khoury, a visiting researcher at the International Center for Tropical Agriculture, or CIAT, in Cali, Colombia.

Khoury and his collaborators went through 50 years of data collected by the United Nations' Food and Agriculture Organization. And they uncovered two big trends.

On my third day in Tehran last week, I was detained by Iran's notorious "morals police." This volunteer corps, with a presence in nearly every city and town, polices infractions against Islamic values. These guardians patrol parks, recreation centers, shopping malls and cafes where young people gather.

My introduction to the morality squad began with shouts and threats and ended with fruit juice and a hug from a lady cop in a black chador that covered bleached blonde hair and a snug red leather jacket.

She headed the women's detention room in the gender-segregated station. My three-hour stay was a revealing look at the gap between these so-called Islamic enforcers and a younger generation chafing under Iran's strict behavior codes.

Iran's new president, Hassan Rouhani, had the backing of many Iranians when he said the morals police "antagonize our society." Within a few months of his election, he barred them from arresting women for what religious hardliners consider "inappropriate dress."

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For history nerds, it's fascinating to see the word "Crimea" back in the news. The last time this peninsula on the Black Sea dominated world headlines was nearly 160 years ago. (Winston Churchill, Franklin D. Roosevelt and Joseph Stalin met there at the town of Yalta in 1945, but that wasn't really about the region.)

The Crimean War of 1853-1856 pitted the Russians against the British Empire, France, the Ottoman Empire and Sardinia. Russia lost. That's about all you need to know about the geopolitics. But the Crimean War played a huge role in the Western zeitgeist of the time, and is notable for the literary, cultural and technological impacts that still reverberate. Here's a quick survey:

Poetry: Alfred Tennyson wrote about a doomed British cavalry charge at the Battle of Balaclava:

"Into the valley of Death
Rode the six hundred."