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In the book The Theory of Relativity, Albert Einstein and his assistant Alice explain to children the strange things that happen in the Universe. It's not easy to understand that time, space and even mass are not constant - they depend on the observer and the reference system! But here, all this is explained in a very simple way. Thanks to clear examples and visual illustrations of experiments, even younger students will be able to understand the world of relativity. The About Science series also includes the books Quantum Physics and Architecture.