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Albert Einstein has long been regarded as a transcendent genius and his theories are being proved by contemporary people. One of them is related to the paradox of twins. Einstein hypothesized that the astronaut took a long trip at roughly the speed of light, while his brother was at home. To my dad son biker poster. When this man returned, he saw that his brother had become an old man. The cause of this event, according to Einstein, was that the time on the spacecraft passed more slowly, leaving the astronauts young.