Alexander the Great was having problems coordinating his military activities until he asked his alchemist for assistance. After considerable experimenting, the alchemist came up with a photosensitive fluid. When a piece of fabric was immersed in it, the fabric would change color with the intensity of sunlight. Ever officer in his army got a strip of this fabric thus treated to wear on his wrist. Thereafter, wherever Alexander's army divisions were, they knew when to attack. The strip became known as Alexander's Rag Time Band!
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