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While the classification of the material world among the ancient Indians, Hellenistic Egyptians, and ancient Greeks into air, earth, fire, and water was more philosophical; scientists of the Middle Ages used practical, experimental observation to classify materials.[3] In Europe, the ancient Greek concept, devised by Empedocles, evolved into the systematic classifications of Aristotle and Hippocrates. This evolved slightly into the medieval system,[citation needed] and eventually became the object of experimental verification in the 17th century, at the start of the Scientific Revolution.[4]