Stratosphere
				
				
			 
			
	
	
	
		
	
	
			
		
		
			
			
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What subject/field am I looking at that deals with things alike to the following: When I take a basic calculator apart, I see several objects, a main circuit board (I think that's what it;s called) a screen and the solar panel. How do all of these things work to make the mathematical manipulations that I punch into it? How does the screen know what to display? how does the circuit board know what numbers are being put in?