The American Chemical Society discusses how chemists are celebrating Earth Day this year. Users can learn how to take part in the 2004 Unifying Event - Testing the pH of Rain Water. Kindergarten through twelfth graders can find out about the music video contest where they are asked to illustrate contributions chemists have made to water chemistry and the environment. Educators can find numerous classroom activities, publications, and other resources to teach their students about water. Chemists looking to become involved in Earth Day should visit this website.