For decades, physicists navigating the dark matter question have leaned on naturalness as an informal compass — a way of trusting some theories more than others without waiting for experimental proof. Stefano Profumo of UC Santa Cruz has now subjected that compass to calibration, applying a formal mathematical measure across twelve dark matter scenarios and finding that the intuitive hierarchy between particle candidates and primordial black holes does not survive quantitative scrutiny. The fine-tuning, it turns out, belongs to specific models and their production mechanisms, not to the broade