The document discusses virtual worlds and their potential uses for teaching, learning, and research. It provides examples of how virtual worlds like Second Life have been used by various academic institutions and researchers. Some concerns about virtual worlds are addressed, such as issues related to privacy, adult content, and costs, but it is argued that virtual worlds can enhance education without replacing other technologies or raising unique issues compared to other online platforms. Challenges of the evolving technology are acknowledged but it is suggested to explore new technologies rather than reject them without consideration.