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dec 31, 1899 - Max Planck

Description:

Observation: He worked with thermodynamics
Conclusion: He made theory on quantum-energy of each quantum is equal to frequency of radiation multiplied by a universal constant (Planck's constant)
Contribution: He revolutionized understanding of atomic and subatomic particles

https://www.britannica.com/biography/Max-Planck

Added to timeline:

Date:

dec 31, 1899
Now
~ 126 years ago