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The Greek mathematician Euclid worked in Alexandria, Egypt, 2300 years ago. 1_______. But he is famous for writing Elements, a series of 13 books. 2_______.In fact, these books were so clearly written that updated versions were still in use in schools in the early 1900s. 3_______. Mathematician and physicist Albert Einstein later proved that Euclid’s geometry was not valid throughout space and time. 4_______.