It can also be caused by. 1  chemicals. 2  contact lens wear(https://www.cdc.gov/contactlenses/index.html) (especially wearing lenses overnight) 3  foreign bodies in the eye (like a loose eyelash) 4  indoor and outdoor air pollution caused, for example, by chemical vapors, fumes, smoke, or dust. 5  fungi.
Voluntarism, sometimes referred to as voluntary action, is the principle that individuals are free to choose goals and how to achieve them within the bounds of certain societal and cultural constraints, as opposed to actions that are coerced or predetermined. 1 Volunteerism. 2 Varieties.
federalism definition. A system of government in which power is divided between a national (federal) government and various regional governments. As defined by the United States Constitution, federalism is a fundamental aspect of American government, whereby the states are not merely regional representatives of the federal government, but are granted independent powers and responsibilities.