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Window/Chaff: When Tinfoil Became a Weapon of War

On the night of July 24, 1943, RAF bombers dropped bundles of aluminum foil strips over the North Sea. German radar screens went white. The entire air defense network of the Third Reich was blinded by tinfoil. The principle — metal disrupts electromagnetic signals — was important enough to weaponize, classify, and deploy in combat.

Hildegard of Bingen on Metals and the Mind (1150 AD)

Hildegard of Bingen — abbess, polymath, Doctor of the Church — wrote in her Physica (c. 1150 AD) that different metals produced different effects on cognition. Tin was associated with clarity and resistance to external corruption of the mind. An 875-year-old prescription for cognitive defense.

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