A college student challenged a senior citizen, saying it was impossible for their generation to understand his. "You grew up in a different world." the student said. "Today we have nuclear energy, jet planes, satellites, space travel, big color TVs, computers, cell phones, nano-technology..." Taking advantage of the pause in the student's litany, the old geezer replied, "You're right. We didn't have those things when we were young; so we invented them! What are you doing for the next generation?"