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Roger Bacon, English Philosopher
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Medieval Scholars, 15th Century
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Antoine-Laurent Lavoisier, French Chemist
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Santiago Ramón y Cajal, Spanish Neuroscientist
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Hippocrates, Ancient Greek Physician
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Euclid, Ancient Greek Mathematician
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Blaise Pascal, French Polymath
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Burning of the Royal Library of Alexandria
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Roger Bacon, English Philosopher
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Rhazes, Islamic Polymath
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Roger Bacon in His Observatory
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Roger Bacon Conducting Experiment
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Diego de Torres Villarroel, Spanish Polymath
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Diego de Torres Villarroel, Spanish Polymath
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Andrés de Urdaneta, Spanish Explorer
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Statue of Blaise Pascal, French Polymath
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Pasteur Institute, Rabies Vaccine Research
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Giotto's Campanile, Astronomy Relief
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Alberto Santos-Dumont, Brazilian Aviation Pioneer
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Pasteur Institute, Anthrax Vaccine Research
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Evangelista Torricelli, Italian Mathematician
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Andrea Cesalpino, Italian Botanist
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Evangelista Torricelli, Italian Mathematician
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Peter Abelard, French Philosopher and Theologian
Royalty Free 
Roger Bacon, English Philosopher
Royalty Free 
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