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In ancient Rome, urine was used as mouthwash because of its ammonia content. During the 1600s, Tulip bulbs were more valuable than gold in the Netherlands. The first vending machine was invented in ancient Egypt—it dispensed holy water. King Tutankhamun’s tomb was discovered over 3,000 years after his death. During the Cold War, the U.S. trained cats to spy on the Soviets. In medieval Europe, animals were put on trial for crimes like murder and theft.