Ailsa Chang

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As the U.S. Senate solemnly considers the fate of a president, Twitter has been somewhat less solemn, considering another question. Can you drink milk on the Senate floor?

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Twenty-four hours over three days - that's how long each side gets to make its case in the Senate impeachment trial.

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Shortly after noon on this cold and bright Tuesday in Washington, President Trump's impeachment trial began. First, some tradition and ceremony - Senate Chaplain Barry Black opened the trial with a prayer.

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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.

Two witnesses testified during the last scheduled day of public impeachment hearings on Thursday. Fiona Hill, a former National Security Council official, and David Holmes, a political counselor in the U.S. Embassy in Ukraine, spoke in front of the House Intelligence Committee — wrapping up two weeks of public and closed-door testimonies to Congress about President Trump's actions in the Ukraine affair. Click the audio link to listen to a special broadcast of NPR hosts and reporters offering analysis on the significant moments of the day.

Four witnesses testified before the House Intelligence Committee on Tuesday in the impeachment inquiry into President Trump: Jennifer Williams, an aide to Vice President Pence; Lt. Col. Alexander Vindman, a National Security Council adviser; Kurt Volker, the former U.S. special envoy to Ukraine; and Tim Morrison, a former National Security Council adviser. Click the audio link to listen to a special broadcast of NPR hosts and reporters offering analysis on the significant moments of the day.

The former U.S. Ambassador to Ukraine, Marie Yovanovitch, testified in front of the House Intelligence Committee on Friday in the public phase of the impeachment inquiry. Click the audio link to listen to a special broadcast of NPR hosts and reporters offering analysis on the significant moments of the day.

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As the protests in Hong Kong press on, the clashes have grown increasingly violent. But there are peaceful gatherings too, like this one at a secondary school for boys.

UNIDENTIFIED STUDENT: Fight for freedom.

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.

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What's it like to be in China as it marks 70 years of communist rule? In Tiananmen Square, facing the famed red outside wall of Beijing's Forbidden City, tanks and missiles rolled past in a military parade today.

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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.

Filmmaker Nanfu Wang grew up in rural China under the country's one-child policy, which was announced in 1979 and not officially rescinded until 2015.

Born in 1985, Wang never knew a life without it — as a kid, she remembers seeing propaganda promoting the rule everywhere.

"At some point, it just became a normal part of life, just like the air, the water, the tree," she says. "And you just stop paying attention, stop questioning, because it has always been there."

There were propaganda matchboxes, lunchboxes, murals and songs on TV.

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