Human greatness has many connotations. Since the requirements for membership in this category are vague and poorly defined, admittance to the Mount Olympus is frequently erratic and subjective, especially in view of a wide "penumbra zone"* of border cases. Nevertheless, rising above a twilight zone of debatable cases, there are individuals whose right for mem bership is unquestionable. In science, one of the unequivocal criteria for "greatness" relates to how far one's scientific achievement affects the opening of new horizons, and points to directions for future development and progress....