The Supreme Court on Friday struck down the federal ban on gun add-ons known as bump stocks. The Trace reporter Chip Brownlee tells us what the decision means. Then, the Tallgrass Prairie National Preserve in Kansas is known as the "last stand" for a grassland that once covered vast swaths of North America. Here & Now's Peter O'Dowd visited the preserve. And, singer Joni Mitchell has reinvented herself throughout her career. NPR music critic Ann Powers' new biography "Traveling" follows Mitchell's wanderings and delves deep into the influences that paved her longer-than-60-year journey.

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