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    Hayden, Founding of Yellowstone National Park  
Dr. Ferdinand Vandeveer Hayden was an American geologist noted for his pioneering surveying expeditions of the Rocky Mountains in the late 19th century. He was also a physician who served with the Union Army during the Civil War. In 1871...
 
    Eduard Suess, Discovery Supercontinent  
Eduard Suess was a geologist who was an expert on the geography of the Alps. He is responsible for discovering two of the Earth's major now-lost geographical features, the supercontinent Gondwana (proposed 1861) and the Tethys Ocean. Sue...
 
    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...
 
    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...
 
    John Muir, Father of the National Parks  
John Muir was a Scottish-American naturalist, author, and early advocate of preservation of wilderness in the United States. His letters, essays, and books telling of his adventures in nature, especially in the Sierra Nevada mountains of Ca...
 
    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...
 
    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...
 
    Kristian Birkeland, Theory of the Aurora  
Kristian Olaf Bernhard Birkeland was a Norwegian scientist. He is best remembered as the person who first elucidated the nature of the Aurora borealis. In order to fund his research on the aurorae, he invented the electromagnetic cannon and...
 
    Yellowstone, First National Park in the World  
Yellowstone National Park is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March...
 
    Alfred Wegener, Discovery Plate Tectonics  
Alfred Lothar Wegener was a German polar researcher, geophysicist and meteorologist. During his lifetime he was primarily known for his achievements in meteorology and as a pioneer of polar research, but today he is most remembered as th...
 
    Krakatoa Eruption, Indonesia  
Krakatoa is a volcanic island in the Sunda Strait between Java and Sumatra in Indonesia. It has erupted repeatedly, massively and with disastrous consequences throughout recorded history. The best known eruption culminated in a series of ma...
 
    Erwin Schrödinger, Schrödinger's Cat  
Erwin Schrödinger, sometimes written as Erwin Schrodinger or Erwin Schroedinger, was a Nobel Prize-winning Austrian physicist who developed a number of fundamental results in the field of quantum theory, which formed the basis of wave mecha...
 
    Friedmann, Expanding Universe Solution  
Alexander Alexandrovich Friedman or Friedmann was a Russian and Soviet cosmologist and mathematician. He discovered the expanding-universe solution to the general relativity field equations in 1922, which was corroborated by Edwin Hubble's...
 
    Arthur Holmes, Plate Tectonics, Age of the Earth  
Prof Arthur Holmes was a British geologist who made two major contributions to the understanding of geology. He pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implic...
 
    Lemaître, Proposed Big Bang Theory  
Georges Lemaître was a Belgian Roman Catholic priest, honorary prelate, professor of physics and astronomer at the Catholic University of Leuven. He sometimes used the title Abbé or Monseigneur. Lemaître proposed what became known as the Bi...
 
       
         
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