Ben Crowell, a teacher at Fullerton College, provides great, free physics and astronomy educational resources at this website. The Physics link offers three well written, downloadable introductory physics textbooks -- one for life science students, one for scientists and engineers, and one for general education students. Each textbook covers topics in Newtonian physics, conservation laws, vibrations and waves, electricity and magnetism, optics, and the modern revolution in physics. In the Astronomy link, users can find an interactive applet for locating the planets in the night sky, a guide for stargazing with binoculars, and a star observation calendar. Students who would like more practice problems can visit the Spotter program, which provides math and science questions and checks their answers.