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  2. Planck's law - Wikipedia

    en.wikipedia.org/wiki/Planck's_law

    In 1905, "Einstein believed that Planck's theory could not be made to agree with the idea of light quanta, a mistake he corrected in 1906." [133] Contrary to Planck's beliefs of the time, Einstein proposed a model and formula whereby light was emitted, absorbed, and propagated in free space in energy quanta localized in points of space. [132]

  3. Archimedes - Wikipedia

    en.wikipedia.org/wiki/Archimedes

    Today this is known as the Archimedean property of real numbers. [71] Archimedes gives the value of the square root of 3 as lying between ⁠ 265 / 153 ⁠ (approximately 1.7320261) and ⁠ 1351 / 780 ⁠ (approximately 1.7320512) in Measurement of a Circle. The actual value is approximately 1.7320508, making this a very accurate estimate.