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Gist: Albert Einstein (; ; 14 March 1879 ? 18 April 1955) was a theoretical physicist. He is best known for his theories of special relativity and general relativity. Einstein received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."{{cite web | url = Nobel Prize in Physics 1921 | accessdate = 2007-03-06 | publisher =Nobel Foundation|archiveurl=

Einstein's many contributions to physics include:

* The special theory of relativity, which reconciled mechanics with electromagnetism

* The general theory of relativity, a new theory of gravitation obeying the equivalence principle

* The founding of relativistic cosmology with a cosmological constant

* The first post-Newtonian expansion, explaining the perihelion advance of Mercury

* Prediction of the deflection of light by gravity and gravitational lensing

* The first fluctuation dissipation theorem which explained the Brownian movement of molecules

* The theory of density fluctuations in gasses and liquids, giving a criterion for critical opalescence

* The photon theory and wave-particle duality derived from the thermodynamic properties of light

* The quantum theory of atomic motion in solids

* Zero-point energy concept

* The semiclassical version of the Schrödinger equation

* Relations for atomic transition probabilities which predicted stimulated emission

* The quantum theory of a monatomic gas which predicted Bose-Einstein condensation

* The EPR paradox

* A program for a unified field theory

* The geometrization of fundamental physics

Einstein published more than 300 scientific works and more than 150 non-scientific works. He is often regarded as the father of Modern Physics and the greatest scientist of the 20th Century. In 1999 Time magazine named him the Person of the Century, beating contenders like Mahatma Gandhi and Franklin Roosevelt, and in the words of a biographer, "to the scientifically literate and the public at large, Einstein is synonymous with genius."


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