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The Number of the Week is: 80,000. That's how many are protesting in Hong Kong, according to organizers. But data journalist Mona Chalabi says estimating crowd size isn't an exact science.

The president, in an address to the General Assembly, says nations are at a crossroads and that the international system must meet challenges ranging from terrorism to disease.

Severe drought has left northern Nevada's farmers scrambling to find enough feed for the cows they already have. It comes as farmers are under pressure to expand to provide powdered milk to China.

NPR's Melissa Block interviews Santa Fe, N.M., Mayor Javier Gonzales about how the city managed to cut water usage by one-fifth while its population grew by 10 percent.

Scientists believe soot that hangs over the mountains of Sichuan Basin — a byproduct of factories and cars — brought about the floods that devastated the region in 2013.

Just two years after dropping to a record low, Lake Michigan's water level is rebounding at a near record rate. It's good news for restoring the habitat, but not so good for some who live on the lake.

The oil industry has faced reduced demand from coronavirus, made worse by a global price war. The Trump administration says it will help by buying up cheap oil for the nation's strategic reserve.

Census Bureau workers are spreading out across the U.S. to make sure they have a list of every home address for next year's head count. Getting left out could lead to an inaccurate 2020 census.

Lesson No. 1: Have "proper precautions in place," says historian Richard Evans. And don't "try to hush it up." Thousands died in Hamburg after the government failed to acknowledge a cholera outbreak.

An ambitious research expedition is getting underway in the Arctic Ocean. The first challenge is to find a massive chunk of ice to freeze into for the year long voyage.