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- Special Relativity (1905): Introduced the concept that the speed of light is constant and that time and space are relative to the observer.
- General Relativity (1915): Proposed a new theory of gravitation, explaining gravity as a curvature of spacetime caused by mass.
- Photoelectric Effect (1905): He explained that light behaves as both a wave and a particle (photons). This laid the foundation for quantum mechanics.
- Nobel Prize (1921): Einstein was awarded the Nobel Prize in Physics for his work on the photoelectric effect, rather than for relativity. [1, 2, 3]
