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Understanding hypotheses
This article explores the process of making and testing hypotheses.
      
   
    
      problem
      
      
    
    
          
Snow and cholera
What information helped medical pioneers decide on the cause of a
disease? Especially in a time before microscopes were as powerful
as they are today ?
      
   
 
    
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Counting fish
I need a figure for the fish population in a lake. How does it help to catch and mark 40 fish?
 
