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In my day, the expression was "same old, same old." It meant if you did something unwise and did it again and expected a different result, you were kind of brain dead.
History records the events that were important in the past. If we do not know what they are, then how can we help not repeating the same things that were already known to us? Only the details are different.
I think the best example of this is wars. The weapons have improved, the tactics changed, the training modified to suit the other two alterations, but in the end the objectives have never changed: the winner is the one who has the most men standing after the slaughter has begun. The ultimate end is death. Yet a lot people didn't do their homework, because we still use wars to solve our problems.
War always means death. If you don't get that out of history, you haven't really studied it.