Read the excerpt from Last Lecture by Randy Pausch.All right. A simple one, being an author in the World Book Encyclopedia. When I was a kid, we had the World Book Encyclopedia on the shelf. . . . We used to have these things called books. [laughter] And after I had become somewhat of an authority on virtual reality, but not like a really important one, so I was at the level of people the World Book would badger. They called me up and I wrote an article, and this is Caitlin Kelleher [shows slide of Caitlin wearing virtual reality headset manipulating a 3D world], and there’s an article if you go to your local library where they still have copies of the World Book. Look under V for Virtual Reality, and there it is. And all I have to say is that having been selected to be an author in the World Book Encyclopedia, I now believe that Wikipedia is a perfectly fine source for your information because I know what the quality control is for real encyclopedias. They let me in.