I know not with what weapons World War III will be fought

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I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

Albert Einstein

March 14, 1879 – April 18, 1955
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). His work is also known for its influence on the philosophy of science.