England tested witches with water. The suspect was bound, right thumb to left toe, looped to a rope, and lowered into the village pond. Pure water was believed to refuse the devil’s servant, so a body that floated was guilty and a body that sank was innocent, and the innocent were hauled up half-drowned to receive the town’s apology. The procedure was called swimming a witch, and its genius was architectural: it could only convict. Whatever the water did, the crowd on the bank went home with the verdict it had carried down to the shore. Four centuries on, the pond fits in a browser tab. Paste the chapter. Click the button. Let the water decide.

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