.1. Printing press. (made it possible for millions to read what only the elites could afford) .2. Radio (made the world a small place, even before t.v. and internet) .3. The Atom Bomb (has and will again change the world, for the last time) .4. wheel (greatest invention to come out of Asia) .5. light-bulb (Thank you Mr. Edison, not Jesus Christ, for showing us the light)