 According to Russo, Hellenistic scientists were not simply forerunners, but actually achieved scientific results of high importance, in the fields of "mathematics, solid and fluid mechanics, optics, astronomy, anatomy, physiology, scientific medicine," even psychoanalysis.They may have even discovered the inverse square law of gravitation (Russo's argument on this point hinges on well-established, but seldom discussed, evidence).Hellenistic scientists, among whom Euclid, Archimedes, Eratosthenes, developed an axiomatic and deductive way of argumentation.