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Phi Kappa Psi boasts a long list of prominent leaders , ranging from congressmen to university presidents to business-world billionaires . Eric : We accept practically all contributors , ranging from coders to designers to documentation proofreaders . Agricultural herbicide applicators are typically exposed to herbicide levels ranging from micrograms to milligrams per cubic meter of air through inhalation , but exposures through the skin are thought to be much greater ( Spear 1991 ) . With in-house expertise ranging from physics to linguistics and systems engineering to visual arts , we pride ourselves on developing individual initiative and talent into important strategic projects and products . " Awards were given in five categories ranging from physics to life sciences . The 13 faculty members in attendance , representing departments ranging from physics to economics , picked up tips on how to prevent and detect plagiarism . The diffusion equations are generally discretized over 2 to 4 layers in order to deal with time scales ranging from days to months .