Short Wave

In remarks from the Oval Office Wednesday night, President Trump announced actions aimed at curbing the spread and economic downfall of coronavirus, which the World Health Organization has classified as a pandemic. The efforts include a ban on travel from European countries to the United States in addition to proposals attempting to ease the financial strain on workers and businesses.

This episode: White House correspondent Tamara Keith, congressional correspondent Kelsey Snell, science correspondent Richard Harris and chief economics correspondent Scott Horsley.

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Despite an underwhelming performance in yesterday's primary contests, Bernie Sanders says he remains a contender for the Democratic presidential nomination. Sanders pointed to Sunday's one-on-one debate with Biden in Arizona as a chance to change the minds of voters who say they like his policy ideas but view Biden as the best option to defeat Trump in November.

This episode: White House correspondent Tamara Keith, political reporter Danielle Kurtzleben, and campaign correspondent Scott Detrow.

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Coronavirus is all over the headlines. Accompanying the growing anxiety around its spread, has been suspicion and harassment of Asians and Asian Americans. For more on this, we turned to Gene Demby, co-host of NPR's Code Switch podcast, and his conversation with historian Erika Lee. We talk about how this wave of stigma is part of a longer history in the United States of camouflaging xenophobia as public health and hygiene concerns.

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Joe Biden's campaign momentum continued on Big Tuesday, with decisive wins in at least three of six primary elections. The results paint a grim picture for Bernie Sanders and his chances of securing the nomination.

This episode: White House correspondent Tamara Keith, campaign correspondents Asma Khalid and Scott Detrow, and senior political editor and correspondent Ron Elving.

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In 2016, biologists and fishermen across the country started to notice something disturbing. Freshwater mussels were dying in large numbers. NPR National Correspondent Nathan Rott tells us about the unsolved mystery surrounding the die-off, the team racing to figure it out, and why mussels are so important for the health of our streams and rivers.

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As financial markets reckon with another acute shock, a question for the White House resurfaces: will it take measures to stabilize the U.S. economy? And Michigan, Missouri, and four other states head to the polls Tuesday, in what could be be a make-or-break day for Bernie Sanders' presidential campaign.

This episode: White House correspondent Tamara Keith, chief economics correspondent Scott Horsley, campaign correspondent Juana Summers, and national political correspondent Don Gonyea.

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Physicists have done the math and there should be as much antimatter as matter — but that hasn't been the case so far. NPR Correspondent Geoff Brumfiel explains what's up with matter's "evil twin," antimatter.

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As the public continues to brace for the spread of the new coronavirus, President Trump has continued to spread misinformation about the disease. And Chuck Schumer, the top Democrat in the Senate, made charged remarks on the steps of the Supreme Court that drew a rebuke from Chief Justice John Roberts.

This episode: congressional correspondent Susan Davis, White House reporter Ayesha Rascoe, White House correspondent Franco Ordoñez, science correspondent Richard Harris, legal affairs correspondent Nina Totenberg, and congressional editor Deirdre Walsh.

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From currency and commerce, food labels to laboratories, the metric system is the foundation of many science and math fields. To mark our 100th episode (a multiple of 10, which is the basis for the metric system!), we spoke with Elizabeth Benham, Metric Program Coordinator at the National Institute of Standards and Technology, about the presence of the metric system in our everyday lives.

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Massachusetts Sen. Elizabeth Warren ended her bid for the presidency on Thursday, marking the end of a campaign that once rocketed Warren to front runner-status. In her exit speech, Warren acknowledged "all those little girls who are gonna have to wait four more years" for a woman to have a shot at the presidency.

Her exit raises questions about why, with a historic number of women running for president, the only seemingly viable candidates remaining are white men.

This episode: White House correspondent Tamara Keith, political reporter Danielle Kurtzleben, and national political correspondent Mara Liasson.

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