Bringing pandemics under management is hard enough; HIV/AIDS is an especially difficult case. One reason is its rapid spread among especially vulnerable adolescent youth, worldwide. Everyone knows that teaching kids to be careful is not easy, but knowing that they pay more attention to each other than to adults has suggested a promising strategy. A Harvard researcher, Dr. John Chittick, found that conventional HIV/AIDS teaching was getting nowhere with youth, and that for many kids, much-needed information was simply unavailable. In 1997 he founded TeenAIDS to train teens to use the Internet to provide complete and accurate medical facts about AIDS to large numbers of their peers, and to teach them to be safe. This peer-to-peer approach has been enormously successful: TeenAIDS has trained peer educators (PeerCorps) in 70 countries and 23 U.S. states. Its website, the oldest on the Internet in this field, has grown into an interactive cyber-center with thousands of hits weekly. Teenagers e-mail questions they don’t dare ask elsewhere, for example about sexual and needle-sharing transmission, and they receive clear answers in their own languages, as well as encouragement to change high-risk behaviors. So here is another way for you to make a difference — in global health, no less.