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The very idea of matter and energy being quantized into particles and photons is the starting point of “quantum” mechanics.

• bookofjoe 1y ago
  >Planck discovers the quantum nature of energy in 1900 https://www.pbs.org/wgbh/aso/databank/entries/dp00qu.html https://www.pbs.org/wgbh/aso/databank/entries/dp00qu.html
  • adastra22 1y ago
    It wasn’t developed into a mechanics until the 1920’s.