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  2. Planking (fad) - Wikipedia

    en.wikipedia.org/wiki/Planking_(fad)

    The palms of the hands are typically touching the sides of the body and the toes are typically touching the ground. [1] Some players compete to find the most unusual and original location in which to play. [1] The term planking refers to mimicking a wooden plank. Planking can include lying flat on a flat surface, or holding the body flat while ...

  3. Planck constant - Wikipedia

    en.wikipedia.org/wiki/Planck_constant

    The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.

  4. Medium-density fibreboard - Wikipedia

    en.wikipedia.org/wiki/Medium-density_fibreboard

    Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibre, often in a defibrator, combining it with wax and a resin binder, and forming it into panels by applying high temperature and pressure. [1] MDF is generally denser than plywood.