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Quantum Physics, Astronomical Physics
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Classical Physics is the physics which was taught and used before RELATIVITY and QUANTUM MECHANICS were introduced. In Classical physics, masses remain constant when they accelerate and clocks tick in unison wherever they are and at all velocities. But this is not true, especially at very high speeds. Relativity is more accurate and is necessary for the speeds that satellites travel at. Classical mechanics cannot explain the dynamics of sub-atomic particles or how light and other kinds of radiation interact with matter. It is necessary, in explaining the structure of atoms and the nuclear processes, to use Quantum Mechanics which "quantises" energy. For example, if one particle is to pass energy to another particle, it can only be done if an exact amount of energy is available. This amount is a "quantum" and the size of a quantum depends on the wavelength of the radiated energy. Nobody knows why. We understand the laws of Classical Physics - they seem logical. Nobody understands relativity or quantum mechanics. However, the laws are true and so we use them and get the right answers. Why the laws of Modern Physics are with us is beyond our understanding, simply because we are humble three dimensional beings, limited to passage through time in a direction and rate beyond our control. In Modern physics there can be many more dimensions and time may pass at variable rates in different places. That is why we can't understand Modern Physics.
The atomic bomb ended the war with Japan quickly and changed modern warfare.
we know about mummification by the evidence found with mummies