This week the Supreme Court heard oral arguments in a case that centers on Monsanto and Bayer's weedkiller Roundup—and its active ingredient glyphosate. Maureen Groppe, Supreme Court correspondent for USA Today, and Lianne Sheppard, Rohm and Haas endowed professor of public health at the University of Washington, explain the legal questions and the science, respectively.

Photo: Roundup weed killing products are offered for sale at a home improvement store on May 14, 2019 in Chicago, Illinois. Credit: Scott Olson/Getty Images.

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