First off, Pausch explained his dream of being in zero gravity. As a child, this had been a dream inspired by Apollo 11, and had stayed with him as an adult. When he was the computer science professor at Carnegie Mellon, he learned of a program that NASA has that allows college students to go up into the air in NASA's Vomit Comet , which uses parabolic arcs to simulate the feeling of weightlessness. Faculty members were not allowed to go (Pausch called this a "brick wall" he faced), so he had to present himself as a web journalist, because local media was allowed on.  Pausch proceeded to begin talking about his second childhood dream, playing in the National Football League .  Although Pausch was never a player in the National Football League, he spoke about his childhood experiences with Pop Warner Football and how they had affected his life and taught him lessons.  Pausch then moved on to his dream of publishing an article in the World Book Encyclopedia . As a child, Pausch always kept and read a World Book Encyclopedia in his home. As he progressed into a career, he became one of the leading professors in the field of virtual reality. World Book then called Pausch, interested in him writing for the encyclopedia. Currently, the article "virtual reality" in the World Book Encyclopedia is the one authored by Pausch.