I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. World War V will be fought with crossbows, World War VI will be lasers, and World War VII will be blowguns. I don’t know about World Wars VIII through XI. World War XII will use the same weapons as III, but will be fought entirely within underground tunnels. World War XIV will—Hey, come back! I have a whole list!

—Albert Einstein