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  2. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.

  3. Journal of School Health - Wikipedia

    en.wikipedia.org/wiki/Journal_of_School_Health

    The Journal of School Health is a monthly peer-reviewed academic journal covering the health of school students. It was established in 1930 as the School Physicians' Bulletin, obtaining its current name in 1937.