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Opus Majus, published by Roger Bacon at Oxford, contains the first written formula for gunpowder in Europe.
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Walter de Milamete detailed information about a bottle-shaped gun he created in a manuscript published in the same year that the gun was invented. The gun greatly resembled a Chinese invention made from similar materials which also utilized gunpowder.
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Gunpowder was invented by Taoist alchemists searching for immortality.
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