"Building Virtual Worlds" lecture and exhibition, given by Professor Randy Pausch (www.randypausch.com) at CMU in April 1998. Professor Gabriel Robins (www.cs.virginia.edu/robins) of UVa posted this video. Randy Pausch is a virtual reality pioneer, human-computer interaction researcher, co-founder of CMU's Entertainment Technology Center (www.etc.cmu.edu), and creator of the Alice (www.alice.org) software project. Other videos by Randy, including higher-resolution downloadable versions of this and other talks, can be found at www.cs.virginia.edu/robins/Randy Less