Albert Einstein: Keep trying
You never fail until you stop trying.
Albert Einstein (Ulm, Germany 14 March 1879 - Princeton, NJ, USA, 18 April 1955) was a German-born theoretical physicist from Jewish origen. later nationalized Swiss and US. He developed the general theory of relativity, one of the two pillars of modern physics. He is considered one of the most important physicists of the 20th century.