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[–]HanssenBob 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (1 child)

Energy in minus energy out.

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

It really is that simple.