 
                            
                        
                        
                        Source: Father and Child Reunion (2001), p. 31.
            "The Decline of Academic Freedom at Dartmouth College", 20 October 2005. 
Letter published in "Appleton Leaves Dartmouth", 2005
        
Source: Father and Child Reunion (2001), p. 31.
“The light in the world comes principally from two sources,—the sun, and the student's lamp.”
Source: Intuitions and Summaries of Thought (1862), Volume II, p. 16.
Interview with Carl Anderson http://oralhistories.library.caltech.edu/89/ (1979). Oral History Project, California Institute of Technology Archives, Pasadena, California.
                                        
                                        http://www.sciencefriday.com/segments/carl-sagan-science-is-a-way-of-thinking/ 
Carl Sagan: 'Science Is a Way of Thinking', Science Friday interview from May 1996 
27 December 2013
                                    
Source: 1960s, Continuities in Cultural Evolution (1964), p. 321
“Good judgment comes from experience, and experience - well, that comes from poor judgment.”
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        