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    Samuel Morton, Natural Scientist  
Samuel George Morton was an American physician and natural scientist. Samuel George Morton is often thought of as the originator of "American School" ethnography, a school of thought in antebellum American science that claimed the differenc...
 
    John Snow, Physician  
John Snow, Physician, reformer. During the cholera epidemics of the late 1840s and early 1850s, physician John Snow realized that cholera is transmitted through contaminated water. His essay, "On the Mode of Communication of Cholera" was fi...
 
    Dr. David Livingstone, Missionary  
David Livingstone was a Scottish Congregationalist pioneer medical missionary and an explorer in Africa. His meeting with H. M. Stanley gave rise to the popular quotation, "Dr. Livingstone, I presume?" Perhaps one of the most popular nat...
 
    John Rae, Explored Northern Canada  
John Rae was a Scottish doctor who explored Northern Canada, surveyed parts of the Northwest Passage and reported the fate of the Franklin Expedition. Rae was born at the Hall of Clestrain in the parish of Orphir in Orkney. After studyi...
 
    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...
 
    Ernst Haeckel, German Naturalist  
Ernst Haeckel was an eminent German biologist, naturalist, philosopher, physician, professor and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms...
 
    Lombroso, Italian Criminologist  
Cesare Lombroso was an Italian criminologist and physician, founder of the Italian School of Positivist Criminology. Lombroso rejected the established Classical School, which held that crime was a characteristic trait of human nature. Inste...
 
    Clemenceau, Prime Minister of France  
Georges Benjamin Clemenceau was a French statesman, physician and journalist. He served as the Prime Minister of France from 1906 to 1908, and again from 1916 to 1920. For nearly the final year of World War I he led France, and was one of t...
 
    Robert Koch, Found Tuberculosis Bacillus  
Robert Heinrich Hermann Koch was a German physician and microbiologist. As the founder of modern bacteriology, he identified the specific causative agents of tuberculosis, cholera, and anthrax and gave experimental support for the concept o...
 
    Ivan Pavlov, Russian Physician  
Ivan Petrovich Pavlov was a Russian physiologist known primarily for his work in classical conditioning. From his childhood days Pavlov demonstrated intellectual curiosity along with an unusual energy which he referred to as "the instinc...
 
    D. E. Salmon, Salmonella Bacteria  
Daniel Elmer Salmon was a veterinary surgeon. He earned the first D.V.M. degree awarded in the United States, and spent his career studying animal diseases for the U.S. Department of Agriculture. He gave his name to the Salmonella genus of...
 
    Doc Holliday, Gunfight at the O.K. Corral  
John Henry "Doc" Holliday was an American gambler, gunfighter, and dentist, and a good friend of Wyatt Earp. He is best known for his role as a temporary deputy marshal in the events leading up to and following the Gunfight at the O.K. Corr...
 
    Aletta Jacobs, 1st Dutch Female Student  
Aletta Jacobs was the first woman in Dutch history to be officially admitted to university. This took place in 1871. As a schoolgirl she had written a letter to Prime Minister Thorbecke requesting permission to be allowed to attend “academi...
 
    Sigmund Freud, Father of Psychoanalysis  
Sigmund Freud was an Austrian neurologist who became known as the founding father of psychoanalysis. In creating psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst, Freud...
 
    Georges Gilles de la Tourette, Tourette Syndrome  
Georges Albert Édouard Brutus Gilles de la Tourette was a French physician and the eponym of Tourette syndrome, a neurological condition. He could be retrospectively classified as a neurologist, but the field did not exist in his time. T...
 
       
 
         
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