An instructor at Fort Leonard Wood, Mo., carries VX nerve agent inside a special chamber used for training in 2003. Brendan Smialowski/Getty Images hide caption

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Brendan Smialowski/Getty Images

The Two-Way

VX: The Nerve Agent Used To Kill Kim Jong Nam Is Rare And Deadly

A colorless, odorless liquid, similar in consistency to motor oil, VX kills in tiny quantities that can be absorbed through the skin. It is among the deadliest chemical weapons ever devised.

Nancy Roach at a conference in 2016. She's long worked as a patient's advocate and recently teamed up with scientists to help improve the design of studies, as well as to improve clinical care. Andrew Wortmann/Courtesy of Fight Colorectal Cancer hide caption

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Andrew Wortmann/Courtesy of Fight Colorectal Cancer

Advice From Patients On A Study's Design Makes For Better Science

Audio will be available later today.

In late 2015, the Obama administration began checking the social media accounts of Syrian refugees seeking to come to the U.S. The practice has continued, and may be expanded, under the Trump administration. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

Trump Administration Weighs Increased Scrutiny Of Refugees' Social Media

Audio will be available later today.

Trumpeter Lee Morgan and wife Helen in 1970. The couple's tragic story is the subject of the documentary I Called Him Morgan, directed by Kasper Collin. Kasper Collin Produktion AB/Courtesy of the Afro-American Newspaper Archives and Research Center hide caption

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Kasper Collin Produktion AB/Courtesy of the Afro-American Newspaper Archives and Research Center

Jazz On Film And The Problem Of The Mad Creative Genius

Audio will be available later today.