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The "De rerum natura" is an epicurean didactic poem written by the Roman poet and philosopher Lucretius in the 1st century BC. Rediscovered by the Italian humanist Poggio Bracciolini in 1417, this work expounds the philosophical system of Epicurus, emphasizing the pursuit of happiness through reason and understanding of the natural world. De rerum natura remains a significant contribution to ancient philosophical thought and literature.