Ailsa Chang

The question of how Billboard determines the most popular music in the country has gotten a lot harder in the digital age. It used to be a simple question of which album sold the most physical copies, but now Billboard needs to consider things like Spotify plays and mp3 downloads. Starting Jan. 3, it will also include YouTube streams.

NPR's Ailsa Chang talks to Chris Molanphy, a chart analyst and pop critic at Slate, about the significance of this change. Listen at the audio link and read on for an edited version of their conversation.

In the industrial city of Dongguan, China, the effects of the trade war on the Chinese economy are measured in idled machinery and empty bar stools.

"One year ago, you probably couldn't even get through the crowd because it would be so busy. But right now, even the smallest vendors can't survive," says Song Guanghui, the owner of Crowdbar, a tricked-out food stall in an open-air market in Dongguan.

Seventy years ago, Mao Zedong appeared on a balcony overlooking Tiananmen Square and conjured a new country into being. On Tuesday, Xi Jinping, arguably the strongest leader since Mao, appeared on that same balcony to reaffirm his vision of modern China.

That vision includes what Xi has repeatedly referred to as the "Chinese Dream," one pillar of which is the idea that all Chinese should have access to the shared prosperity of the nation.

Greta Thunberg led a protest at the White House on Friday. But she wasn't looking to go inside — "I don't want to meet with people who don't accept the science," she says.

The young Swedish activist joined a large crowd of protesters who had gathered outside, calling for immediate action to help the environment and reverse an alarming warming trend in average global temperatures.

She says her message for President Trump is the same thing she tells other politicians: Listen to science, and take responsibility.

To understand the music of Black Belt Eagle Scout, it helps to know a little bit about the place frontwoman Katherine Paul grew up. The artist was raised on Swinomish Indian Reservation in Washington. With there only being about 1,000 people in the Swinomish tribe — and not all of them living on the reservation — Paul's community was extremely tight knit.

Common is no stranger to showing emotion. With more than 20 years in the spotlight, the Chicago-hailing rapper, actor and activist has worn his heart on his sleeve publicly for years and won plenty of accolades for it. Common is one of the few distinguished artists to have won an Emmy, Grammy and Oscar award in the span of his career.

As a kid, Enrique Olvera spent hours in his grandmother's bakery in Mexico City. He loved watching everyday ingredients like flour, sugar and eggs fuse into something entirely different.

For Olvera, even the simple act of baking a cake felt like magic.

He absorbed every detail as his grandmother gently coaxed masa into handmade tortillas. On Sundays, he joined his father in the kitchen, chopping onions and tomatoes for breakfasts of scrambled eggs and dry beef.

Lt. Col. Bree "B" Fram left a doctor's office on April 2. Presenting that day as Bryan, the name given to them at birth, B should have been relieved.

"Overall, it's a good thing," said B. "It just didn't feel great to have to do it on someone else's timeline other than my own."

"It" was an official diagnosis of gender dysphoria. As a transgender member of the military, B had to secure the diagnosis by April 12 in order to continue serving openly.

Quinn Robinson is only 18 years old, but she has already learned some hard lessons about the world. "It's scary being a trans person because I know there are people out there who just hate me for being myself," she says. "There's been kids who have approached me and say, 'Hey, you should burn in hell.' "

Robinson is a high school senior in Allendale, Mich., a small but growing town about 30 minutes outside Grand Rapids and smack dab in the middle of what's known as the state's "Bible Belt." Drive off the main road and you quickly find yourself in farm country.