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.

The past is prologue in Steph Cha's new novel, Your House Will Pay.

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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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