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1939
 
    
US chemist Linus Pauling publishes his collected discoveries on The nature of the chemical bond       
1945
 
    
British chemist Dorothy Hodgkin describes the molecular structure of penicillin       
1949
 
    
The technique of radiocarbon dating is developed by US chemist Willard Libby       
1951
 
    
Syntex, a small chemical company in Mexico City, develops the first oral contraceptive       
c. 1961
 
   
The drug Thalidomide, synthesized in West Germany, is shown to have been the cause of severe defects in about 12,000 children born in 46 countries      
2011  August 5
 
 
NASA announces that it has photographic evidence from the Mars Reconnaissance Orbiter of possible liquid water on the planet in warm seasons