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Open Educational Resources are articles, ebooks, books, images, and other materials that may be used by faculty and students without restrictions. These materials are released under an open license that permits their free use and adaptation by others.


Open Access, or OA, in scientific publishing is bringing long-due attention to the question of availability.  University libraries pay millions of dollars a year for subscriptions to a package deals of various journals, rather than being able to select only the journals that they want for their libraries.  The rate of retractions in these journals have increased.  Is the cause of this due to a more vigilant look at the published articles or that the race to publish in “in superstar journals and over-reliance on impact factor leads to misplaced incentives and rewards showy failures.” (The Scinder)
On OA, articles are basically broken down into two types:  GREEN and GOLD
GREEN:  refers to self-hosting of copies by a person, lab, or university.   These can be archived and made available as pre-prints, post prints, or in the final formatted version published by a journal.
GOLD:  These are selected by the publisher or the journal - not the author or a university.  Authors often have to pay a large fee to have their articles published. Many journals have explicit policies that allow GREEN OA after a certain grace period.  
Along with the GREEN AND GOLD you can add the colors of BLUE and WHITE
BLUE:  are post-print articles and the publisher's version
WHITE:  are not designated and not allowed