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Empedocles (c.490–430 BC)
Sicilian Pythagorean philosopher who developed the notion that there were four fundamental elements in matter – earth, air, fire, and water. In medicine Empedocles taught that blood ebbed and flowed from the heart and that health consisted in a balance of the four humors in the body.
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• PHILOSOPHYAlso on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History