Einstein published his theory of General Relativity (GR) in stages. Based on these publications, Karl Schwarzschild found two exact solutions in January and February 1916. However, on May the 11th of that year, Einstein published his official GR – with important changes effecting both of Karl’s exact...

After publication in 1905 of his Special Relativity, Einstein was praised but he also got a lot of criticism. Paul Ehrenfest, Mach and others revealed inconsistencies. Einstein listened to them and made crucial improvements in 1916 so that the famous paradoxes disappeared. It formed the basis for his General...

How many people understand Relativity? Many say they do, but how do they explain the paradoxes of Special Relativity (SR)? Do they know that Einstein changed his mind about his own SR in 1916? They should know that he abandoned the equality of reference frames already in 1916, solving the twin paradox. Then Einstein...