During the 1998-1999 school year, teams across the United States are investigating earth science topics in their communities. Each team consists of an informal science institution, like a science center or museum, and nearby schools. The teams are sharing their ideas and results so that everyone can learn together. The world wide web makes this national collaboration possible. The teams are using the web to access science resources, communicate with scientists and each other, and to work together. Meet the Teams Browse the Resources "Our Changing Earth" is an initiative of the American Association for the Advancement of Science (AAAS), in collaboration with The Franklin Institute and Unisys Corporation, as the theme for National Public Science Day, 1999. In the past, Public Science Day has been a one-day, opening event for the AAAS Annual Meeting, celebrated only in the host city. Last year, the event focused on an ongoing school investigation around the theme of "Scientists in The City." This year, AAAS with its partners, The Franklin Institute and Unisys, is expanding the scope of the event by increasing the number of sites that participate. The project teams will spend several months conducting their investigations, and, then, on January 21, 1999, pause to celebrate their work by showcasing the results at the partner science institution. The host city for the meeting this year is Anaheim, California, and the teams will celebrate Public Science Day in their hometowns across the country. The mission of Public Science Day, 1999 is to raise public awareness about the importance of science education in the U.S. and abroad, and to heighten the enthusiasm for science and technology learning and understanding across all demographics.