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Opus Majus, as suggested by Pope Clement IV, was a comprehensive scientific treatise written by Roger Bacon in the 13th century. It encompassed various fields of knowledge, including mathematics, optics, astronomy, alchemy, and philosophy. Bacon aimed to synthesize all existing knowledge and pave the way for future advancements. Opus Majus showcased Bacon's experimental approach and emphasis on empirical evidence, making it a significant work in the history of science.