The present revolution of scientific thought follows in natural sequence on the great revolutions at earlier epochs in the history of science. Einstein's special theory of relativity, which explains the indeterminateness of the frame of space and time, crowns the work of Copernicus who first led us to give up our insistence on a geocentric outlook on nature; Einstein's general theory of relativity, which reveals the curvature or non-Euclidean geometry of space and time, carries forward the rudimentary thought of those earlier astronomers who first contemplated the possibility that their existence lay on something which was not flat. These earlier revolutions are still a source of perplexity in childhood, which we soon outgrow; and a time will come when Einstein's amazing revelations have likewise sunk into the commonplaces of educated thought.
 
    
        Arthur Eddington 
     
    
     
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        I shall present a theory - which I call "the theory of the managerial revolution." During the past century, dozens, perhaps even hundreds, of "theories of history" have been elaborated. All of the theories, with the exception of those few which approximate to the theory of the managerial revolution, boil down to two and only two. The first of these predicts that capitalism will continue for an indefinite, but long, time, if not forever:' that is, that the major institutions of capitalist society, or at least most of them, will not be radically changed. The second predicts that capitalist society will be replaced by socialist society. The theory of the managerial revolution predicts that capitalist society will be replaced by "managerial society," that, in fact, the transition from capitalist society to managerial society is already well under way. 
         
 
    James Burnham 
 
                 
            
        
     
    
    
                                        
                    
    
        In conclusion, it appears to me that nothing can be more improving to a young naturalist, than a journey in distant countries. It both sharpens, and partly likewise allays that want and craving, which, as Sir J. Herschel remarks, a man experiences although every corporeal sense is fully satisfied. The excitement from the novelty of objects, and the chance of success, stimulate him to increased activity. Moreover as a number of isolated facts soon become uninteresting, the habit of comparison leads to generalization. On the other hand, as the traveller stays but a short space of time in each place, his descriptions must generally consist of mere sketches, instead of detailed observation. Hence arises, as I have found to my cost, a constant tendency to fill up the wide gaps of knowledge, by inaccurate and superficial hypotheses. 
         
 
    Charles Darwin 
 
                 
            
        
     
    
    
    
    
    
    
                                        
                    
    
        He (Gauis Gracchus) was a political incendiary. Not only was the hundred years' revolution which dates from him, so far as it was one man's work, the work of Gaius Gracchus, but he was above all the true founder of that terrible civic proletariat flattered and paid by the classes above it, which was through it aggregation in the capital - the natural consequence of the largesses of corn - at once utterly demoralized and made conscious of its power, and which - with its pretensions, sometimes stupid, sometimes knavish, and its talk of the sovereignty of the people - lay like an incubus for five hundred years upon the Roman commonwealth and only perished along with it. And yet again, this greatest of political transgressors was the regenerator of his country. There is scarce a fruitful idea in Roman monarchy, which is not traceable to Gaius Gracchus. 
         
 
    Theodor Mommsen