A few years ago, scientists cracked a murder mystery -- they figured out what's been killing Coho salmon in urban streams in the Pacific Northwest. The culprit: particles from tires.
In this week's StoryCorps, Philadelphia radio host Cherri Gregg remembers her grandmother, Maryhall Fuller Robinson Snead, who helped her find her voice.
Rob Schmitz is NPR's international correspondent based in Berlin, where he covers the human stories of a vast region reckoning with its past while it tries to guide the world toward a brighter future.