as a basically retired electronics tech, I can relate, "conservation of energy" ... same concept ..

. I like to here all the interpretations of this idea though

HEAR ! lol I am an older guy, so I (Listen) to the concept, NOT pick apart the words that are written, I call that being "Legalistic" ... so many can't grasp the concept because they are dissecting what is written. ie, You wrote here instead of hear, but I understood what you were saying because I listen to the "concept" of what your saying .. People need to understand, the word free, in this case it means "something for nothing " the concept of TANSTAAFL means there is NO SUCH THING AS FREE ... a Dime laying on the street is NOT FREE, it cost YOU energy to reach down and pick it up ... NOTHING is free ... except sunlight .. air is NOT free .. it cost YOU energy to breath it !