Aviation, Transportation and Sparrows

I came upon the following picture of airplanes taking off from Hannover airport, and it reminded me a flock of sparrows launching from a tree.  (http://aviationjustice.org/2012/12/18/ho-yeul-ryu-airport/)

I am not going to lecture about the importance of air travel, etc., but normally, we think about transportation as items of one:  one truck, one plane, one barge, one train… but in relativity it is an ongoing conveyor belt of material, components and people.  It is a system that works, but in many ways, it is a system that always seem to be staining at the limits of what could be, going everywhere in a hurry.



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