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Our own experience of our free will has been classified as either supernatural or an illusion because it is difficult to reconcile with macroscopic determinism as well as with microscopic quantum randomness. The former constituting a prison in which no freedom can exist, the latter signifying destructive chaos rather than creative action. Lost in this dichotomy is the demonstrated constructive combination of chance and necessity in complex systems, such as evolution. Recent converging evidence from neuroscience, ecology and genetics suggests that nervous systems, including human brains, have evolved neural circuits that harness (potentially quantum) chance events by embedding them in the controlling architecture of neuronal rules, in order to carefully inject them as creative components into ongoing goal-directed behavior. This presentation contains evidence that this form of behavioral variability may constitute a necessary neural mechanism for free will to evolve in humans.