I do not know how the third world war will be fought, but I can tell you what they will use in the fourth... rocks."

When asked how World War III would be fought, Einstein replied that he didn't know. But he knew how World War IV would be fought: With sticks and stones!

So long as there are men there will be wars. So long as there are men there will be wars.

So long as there are men there will be wars

I don't know the weapons that will be used in the Thirth World War, but in the Forth men will use wood and stones.

I don't know what weapons will be used in world war three, but in world war four people will use sticks and stones.