This collection of science education web sites is designed to serve as an Internet resource guide for current and future science teachers at the K-12 grade levels. It explains what the Internet is and how teachers can navigate the World Wide Web (www) to teach and plan science lessons. The strength of this supplemental text is its extensive descriptions and URLs (addresses) of hundreds of high-quality science and science education sites on the www. The use of case studies, illustrations, and detailed explanations make this supplement a great reference because it makes users (even those with no experience) feel comfortable as they explore science on the Internet.