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.

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.

The new movie Us, Jordan Peele's follow-up to Get Out, is a horror movie.

It starts with a black family on vacation. They go to the beach; dad buys a boat. Then things start getting creepy.

One night, another family dressed in red jumpsuits shows up in front of the house. And each member of this new family — mom, dad, sister, brother — is an identical copy of the family inside. They're doppelgangers.

The new movie If Beale Street Could Talk is based on a James Baldwin novel of the same title.

Barry Jenkins (Moonlight) adapted and directed the film. And in working with the Baldwin estate, he received a leather notebook filled with Baldwin's handwritten notes about how he would have approached a film version.

Cooking is about community. But it can also be about solitude.

That's where chef Anita Lo's latest cookbook, Solo: A Modern Cookbook for a Party of One, comes in.

"Food is culture, food is identity. So it's reaffirming to cook the things that either you grew up with or the things that you love," Lo says — whether it's for your whole family or just yourself.

NPR's Planet Money has learned that more than 13,500 immigrants, mostly Chinese, who were granted asylum status years ago by the U.S. government, are facing possible deportation.

As the Trump administration turns away asylum-seekers at the border under more restrictive guidance issued by Attorney General Jeff Sessions, U.S. Citizenship and Immigration Services, Immigration and Customs Enforcement and the Executive Office for Immigration Review are considering stripping asylum status from immigrants who won it years ago.

In the world of jazz, most musicians choose one single thing and get as good as humanly possible at it, but not Camille Thurman. She's known as a double threat: The rare jazz musician who has mastered both a highly technical instrument — in her case, the saxophone — and sings. Thurman's vocals have been compared to Ella Fitzgerald. Her latest album, Waiting for the Sunrise, is out now.

Last year, NPR Music picked the 150 greatest albums made by women for the first year of the Turning The Tables series, an ongoing project dedicated to recasting the popular music canon in more inclusive ways.

President Trump has a heaping plate of foreign policy background to consume in May, which will see a possible summit with the leader of North Korea, a deadline to decide on restoring Iranian sanctions, and the move of the U.S. Embassy in Israel from Tel Aviv to Jerusalem.

In the past, most presidents have leaned on the intelligence community for guidance and context — but Trump has made plain his differences with the CIA, FBI and National Security Agency.

In jails and prisons across the United States, mental illness is prevalent and psychiatric disorders often worsen because inmates don't get the treatment they need, says journalist Alisa Roth.

In her new book Insane: America's Criminal Treatment of Mental Illness, Roth investigates the widespread incarceration of the mentally ill in the U.S., and what she sees as impossible burdens placed on correctional officers to act as mental health providers when they're not adequately trained.

In 1993, Alex Wagner saw a familiar face on the cover of Time magazine: It was a computer-generated picture of a multiethnic woman who reminded her of ... herself.

Wagner's father is white and from the Midwest; her mother is from what was then Burma. And after reading the Time story on "The New Face of America," Wagner, then a teenager, decided to embrace her identity as a "futureface."

A couple of years ago, Bernie Dalton was a strong, physically fit, 40-something-year-old surfer. Every morning, he would get up at 4 A.M. to watch the sunrise in Santa Cruz, Calif. Bernie wasn't a musician at the time, but he was passionate about music. His lifelong dream was to record an album.

Friday is April 20, a day that some people celebrate by smoking marijuana. The Police Department in Lawrence, Kan., is preparing for this week's pot holiday by sending safety tips via their official Twitter account, run by officer Drew Fennelly.

A sports editor at The Kansas City Star retweeted it, and Fennelly says it became the account's first tweet with national reach.

"It ended up getting a couple thousand likes, over 1,000 retweets," he says.

Desiree Linden became the first American woman to win the Boston Marathon since 1985 — finishing 26.2 miles in 2 hours, 39 minutes and 54 seconds on Monday.

The 34-year-old two-time Olympian lives in Michigan, and she finished second at the Boston Marathon in 2011. But her victory this week almost didn't happen.

In the cold rain and wind, Linden says she wasn't feeling well and thought about bailing out of the race.