Joel Gallant, M.D., M.P.H., is not only a widely respected HIV clinician and researcher: He's also an online HIV expert, spending some of his free time answering questions about the virus. He's been doing this since the early days of the Internet. He's so good at it that he's just had a book published that pools together some of the most important questions he commonly answers. Called "100 Questions and Answers About HIV and AIDS," it's geared mainly for people with HIV who want to learn more, and Dr. Gallant is here to talk to us about it.