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    Clair Patterson, Calculated an age for the Earth  
Clair Patterson was a geochemist born in Mitchellville, Iowa, United States. He graduated from Grinnell College in Grinnell, Iowa, received his Ph.D. from the University of Chicago, and spent his entire professional career at the California...
 
    Sven Hedin, Explorer Central Asia  
Sven Anders Hedin was a Swedish geographer, topographer, explorer, photographer, and travel writer, as well as an illustrator of his own works. During four expeditions to Central Asia he discovered the Transhimalaya (once named the Hedin Ra...
 
    Przhevalsky, Explorer Central Asia  
Nikolai Mikhaylovich Przhevalsky also transliterated Przewalski, was a Russian geographer of Polish origin and explorer of Central and Eastern Asia. Although he never reached his final goal, Lhasa in Tibet, he travelled through regions unk...
 
    Von Richthofen, Traveller Silk Roads  
Ferdinand Freiherr von Richthofen was a German traveller, geographer, and scientist. He traveled or studied in the Alps of Tyrol and the Carpathians in Transylvania. In 1860, he joined the Eulenburg Expedition, a Prussian expedition which...
 
    Nordenskiöld, Crossing Northeast Passage  
Baron (Nils) Adolf Erik Nordenskiöld also known as A. E. Nordenskioeld was a Finnish-Swede geologist, mineralogist and arctic explorer, and a member of the prominent Finland-Swedish Nordenskiöld family of scientists. Born in the Grand Duchy...
 
    Sir Richard Burton, Explorer, etc.  
Captain Sir Richard Francis Burton KCMG FRGS was a British geographer, explorer, translator, writer, soldier, orientalist, cartographer, ethnologist, spy, linguist, poet, fencer and diplomat. He was known for his travels and explorations wi...
 
    David Thompson, Canadian Explorer  
David Thompson was an English-Canadian fur trader, surveyor, and map-maker, known to some native peoples as "Koo - Koo - Sint" or "the Stargazer". Over his career he mapped over 3.9 million square kilometres of North America and for this ha...
 
    Samuel de Champlain, Founder Quebec - 1608  
Samuel de Champlain was a French Explorer. He made several expeditions to North America before founding Quebec in 1608 with 32 colonists, most of whom did not survive the first winter. He joined with the northern Indian tribes to defeat Iro...
 
    Abraham Ortelius, 1st Modern Atlas  
Abraham Ortelius (Abraham Ortels) was a cartographer and geographer, generally recognised as the creator of the first modern atlas. He was born in Antwerp in what is now Belgium. A member of the influential Ortelius family of Augsburg, he t...
 
    Piri Reis, Ottoman Admiral, Cartographer  
Ahmed Muhiddin Piri, better known as Piri Reis, was an Ottoman admiral, geographer, and cartographer. He is primarily known today for his maps and charts collected in his Kitab-ı Bahriye (Book of Navigation), a book that contains de...
 
    Avicenna, Ibn-Sina, Persian Polymath  
Avicenna is the Latinate form of Ibn-Sina. He was a Persian polymath regarded both in Europe and the Middle East as one of the most significant thinkers and writers of the Islamic Golden Age. He is known to have written around 450 works acr...
 
    Sylvester II, 1st French Pope  
Pope Sylvester II, born Gerbert d'Aurillac, was a prolific scholar, teacher, and Pope. He endorsed and promoted study of Arab/Greco-Roman arithmetic, mathematics, and astronomy, reintroducing to Europe the abacus and armillary sphere, which...
 
 
780 - 850
  Al-Khwarizmi, Persian Scholar, Father of Algebra  
Al-Khwarizmi was a Persian scholar who produced works in mathematics, astronomy, and geography. Around 820 AD he was appointed as the astronomer and head of the library of the House of Wisdom in Baghdad. Al-Khwarizmi's popularizing treat...
 
 
120 - 180
  Pausanias, Description of Greece  
Pausanias was a Greek traveler and geographer of the 2nd century AD, who lived in the times of Hadrian, Antoninus Pius and Marcus Aurelius. He is famous for his Description of Greece, a lengthy work that describes ancient Greece from firsth...
 
 
90 - 168
  Ptolemy, Astronomer / Mathematician  
Claudius Ptolemy was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in the city of Alexandria in the Roman province of Egypt...
 
       
         
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