i dont know what the angle for your presentation is, but have you noticed how many things we have in our homes (inventionwise ) were prevoiusly military?
like:
computers - during world war 2 Americas Defense Department needed an easier way to sort out their firing / ballistic calculatiosn so 2 guys @ University of Pennsylvania found a solution for the Defense Department's dilemma. In 1946, they developed a computer n calculator thing.
internet - u.s defense based closed system
so thats mostly technology wise, but im sure there are other examples.