On lightning and safety and electrostatics: "Answer to Is there a device that attracts lightning when storms are near? How can I make a lightning rod to do experiments with lightning?" (202_ yrs ago) https://www.quora.com/Is-there-a-device-that-attracts-lightn... :
> Einstein theorized that the energy in each quantum of light was equal to the frequency of light multiplied by a constant, later called the Planck constant. A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect. This was a step in the development of quantum mechanics. In 1914, Robert A. Millikan's highly accurate measurements of the Planck constant from the photoelectric effect supported Einstein's model, even though a corpuscular theory of light was for Millikan, at the time, "quite unthinkable". [47] Einstein was awarded the 1921 Nobel Prize in Physics for "his discovery of the law of the photoelectric effect", [48] and Millikan was awarded the Nobel Prize in 1923 for "his work on the elementary charge of electricity and on the photoelectric effect".[49]
Electrostatics: https://en.wikipedia.org/wiki/Electrostatics
The Photoelectric effect that supports the Particle-Wave duality > History: https://en.wikipedia.org/wiki/Photoelectric_effect :
> Einstein theorized that the energy in each quantum of light was equal to the frequency of light multiplied by a constant, later called the Planck constant. A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect. This was a step in the development of quantum mechanics. In 1914, Robert A. Millikan's highly accurate measurements of the Planck constant from the photoelectric effect supported Einstein's model, even though a corpuscular theory of light was for Millikan, at the time, "quite unthinkable". [47] Einstein was awarded the 1921 Nobel Prize in Physics for "his discovery of the law of the photoelectric effect", [48] and Millikan was awarded the Nobel Prize in 1923 for "his work on the elementary charge of electricity and on the photoelectric effect".[49]