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The field of Physics Education Research has grown substantially in recent decades. This growth has resulted in significant knowledge about effective teaching and learning of physics at the postsecondary level in the United States and has been put into practice in the de-velopment and testing of a wide variety of curricular materials and instructional approaches. This knowledge and resultant materials have been widely disseminated to physics instructors in the US,resulting in widespread adoption of highly effective research-based instructional practices.The growth and positive impact of Physics Education Research would not have been possible without significant and ongoing government funding.