CAN BE REVEALED in the stupidity of the cliches they use. E.G.: “Changed the course of history.” Every one of them uses it to describe epochal events. What does it mean? History is the record of major events. The course of history is set, because it happened in the past. You cannot — by definition — change the course of history while it’s happening. You can MAKE history, and most epochal events are history-making.
To change the course of history would be to alter the past. Or discover something new about the past that will have an altering effect on the record. Say: Hitler and Eva Braun were discovered in the bunker in flagrante hiding this fact was what drove Goebbels to drag their bodies out and burn them in the garden, or whatever. This is contrary to what is known or thought about the events of April, 1945, and would change history, though the events of that time have not changed, nor our understanding of them, so the course of history remains unchanged.