good example. due to insufficient knowledge about its effects (no theory regarding matter and its interactions) humans had to go by trial-and-error. which led t

good example. due to insufficient knowledge about its effects (no theory regarding matter and its interactions) humans had to go by trial-and-error. which led to bad outcomes like consuming lead, mercury and countless others agains ailments/diseases. so, one could see it as a very long-running clinical phase II(?) trial. so thank you science for not judging morally but giving us explanations and real evidence so we can decide if and for whom it may be appropriate.