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Aristotle. Illustration of a bust of the Ancient Greek philosopher and logician Aristotle (384-322 BC). After studying at Plato's Academy, he went on to tutor the young Alexander the Great. Aristotle proposed theories on almost every subject. He produced a detailed description of the universe, with the Earth at its centre. He studied biology as well, and carried out many animal dissections. He divided animals into groups depending on whether they laid eggs or not, the first documented attempt at scientific taxonomy. He also wrote detailed works on logic, which were the standard texts for over two millennia.
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