Laurel Dalrymple
[Copyright 2024 NPR]
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When a plane crashes, it can take many months or years to find the black box that provides clues to what happened. Just what are these devices, how do they work, and why can they be so hard to find?
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At Philadelphia's historic prison, Cellblock 12 is known for cackling and echoing voices, Cellblock 6 for shadowy figures darting along the walls, Cellblock 4 for ghostly faces. Footsteps. Wails. Whispers. For decades, people have told the same eerie stories, over and over again.