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7 of Albert Einstein’s Theories that Changed the World
Albert Einstein: His life, theories and impact on science
Albert Einstein | Biography, Education, Discoveries, & Facts
Einstein's Theory of Gravitation - Center for Astrophysics
Relativity | Definition, Equations, & Facts | Britannica
Theory of relativity - Wikipedia
How Albert Einstein Developed the Theory of General Relativity
General relativity - Wikipedia
Special relativity - Wikipedia
The Theory of Relativity, Then and Now | Smithsonian