Since the Internet was created by geeks, it's no surprise that it's loaded with science sites. And since the topic is so vast, your best bet for finding help with a specific problem or question is to browse through one of the general directories such as B.J. Pinchbeck's Homework Helper. If, however, you'd just like to have some brain-powered fun, head straight to Reeko's Mad Scientist Lab. Here you'll find instructions on building miniature hovercrafts, working volcanoes and many more irresistible home experiments, plus answers to such eternal questions as "Do cats have belly buttons?"

In the real world, we take kids to science museums to learn about the subject. Now two of the best such museums in the country have Web sites to match. Philadelphia's Franklin Institute has excellent online exhibits as well as a nice selection of simple, grade-rated experiments kids can do at home. San Francisco's Exploratorium boasts a collection of Science Snacks (their term for quick experiments), of which most kids won't be able to eat, so to speak, just one.

Anyone seeking info on the solar system need look no further than The Nine Planets. Kids can take an overall multimedia tour of the planets (with sound, images and movies), or zoom in on a particular subject. For an outstanding introduction to chemistry, try Chem4Kids. Simple language, clear and fun illustrations and a great sense of humor make for the best chemistry lessons we've ever seen. Lastly, check out every kid's favorite science subject, dinosaurs, at Zoom Dinosaurs, an online interactive textbook on the terrible lizards.