Created the Theory of Relativity , one of the founding theories of our age.
Simplified his life, to be busy with his work. Few other pleasures: sailing and violin.
Progress of Einstein’s thought: from special to general.
Photoelectric effect -> Brownian motion -> special theory of relativity -> general theory -> unified theory
In "My Credo ", he writes: «All theories should be presented to children. If a child cannot understand it, it’s worthless”. (Maybe this is from another work of his)