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Early Iranians believed evil had to have a source outside of God, which led to the concept of an entity as powerful and utterly evil as God is potent and good. These two forces, good and evil, which have always vied for superiority, needed helpers in this struggle. According to the Zoroastrians, every entity had to take sides, from the cosmic level to the microcosmic self. One of the results of this battle was that certain humans were thought to side with evil. Who were these allies of that great Evil Spirit? Women were inordinately singled out. Male healers were forbidden to deal with female health disorders because of the fear of the polluting power of feminine blood. Female healers, midwi...
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by Professor Poul Harremoes Environmental engineering has been a discipline dominated by empirical approaches to engineering. Historically speaking, the development of urban drainage structures was very successful on the basis of pure empiricism. Just think of the impressive structures built by the Romans long before the discipline of hydraulics came into being. The fact is that the Romans did not know much about the theories of hydraulics, which were discovered as late as the mid-1800s. However, with the Renaissance came a new era. Astronomy (Galileos) and basic physics (Newton) started the scientific revolution and in the mid-1800s Navier and Stokes developed the application of Newtons law...
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