I like these  composite posts  dedicated to well-defined  topics. They are akin to scientific reviews  summarizing current state of knowledge in various areas. 
 
These are great educational tools showing “The Big Picture”. From there on we can diverge into discussions of particular features, establish boundaries of the  
“known” and map what is yet “unknown”. That’s how the learning and science work. 
 
Great job, Jose!
		 
		
		
		
		
		
		
		
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