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Planck's thoughts revolved around the principle of entropy and how to grasp "irreversibility" dependent on the absolute truth of the entropy law, a version of the second law of thermodynamics interpreted in terms of the entropy concept.
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To address some of the issues with the wave theory of light, Max Planck proposed a quantum theory of radiation.
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Planck's first writings were on the subject of thermodynamics, which he became interested in after studying under Kirchhoff, whom he admired.  Kirchhoff was a German physicist who made important contributions to our knowledge of electrical circuits, and the emission of black-body radiation from heated objects.

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His motivation was not a desire to achieve a breakthrough, but a fascination with science itself, a desire to learn everything there was to know about the very origins of nature.

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Planck was very creative, intelligent and very passionate about the origins of nature and radiation.