• Top Pick: VolcanoWorld  - for everyone from elementary school aged kids to senior volcanologists.
• Cool Pick: Yuckiest Site on the Internet - explore the living sciences of entomology, earth science, and human biology through roaches, earthworms, and the mysterious human body.
• Amusement Park Physics: What Are the Forces Behind the Fun?  - interactive exhibit exploring how the laws of physics play a role in the design of amusement park rides.
• Earthquake Information from the USGS  - daily and weekly quake reports, geophysical information on earthquakes, and other background information.
• Galileo Project, The  - Rice University presents a hypertext source of information on the life and work of Galileo Galilei (1564-1642) and the science of his time.
• International Tiger Information Center  - forum for exchanging information relevant to the preservation of wild tigers.
• Windows to the Universe  - user-friendly learning system on the earth and space sciences for use by the general public. Developed by NASA.
• American Experience: Lindbergh - a thorough examination of the many facets of the life of Charles Lindbergh. Includes an interactive map of his historic flight and a timeline of other aviation milestones.
• Bad Astronomy - righting wrong ideas.
• Biology Project - an online interactive resource for learning biochemistry, Mendelian genetics, immunology, and cell, developmental, human, and molecular biology, developed at the University of Arizona.
• Calculating Machines - history, classification and pictures of mechanical calculating machines.
• Cats! Wild to Mild - exhibition presented by the Natural History Museum of Los Angeles County tracing the natural history of the cat from wild, exotic feline to one of America's favorite pets.
• Circlemakers - England's crop circle makers.
• Elephants of Cameroon - join the North Carolina Zoo and a team of researchers on an interactive project to track and study elephants in Northern Cameroon.
• Evidence: The True Witness - learn about forensics science, including fingerprinting, DNA, and ballistics.
• Exploratorium's Guide to Sunspots - explore the nature of sunspots and the fascinating history of our efforts to understand them.
• explorezone.com - from earthquakes to comets, tsunamis to sunspots. A starting point for science with news, animated reference and book reviews.
• Florida Panther Net - a rich store of knowledge about the elusive, endangered Florida panther, its habitat, and the plants and animals that share its southwest Florida home.
• Glacier - explores Antarctica, and features live reports from the ice. Developed by the NSF, the Education Development Center and Rice University.
• How Stuff Works - series of articles that explores the workings of devices from cell phones to refrigerators, and explains the principles behind things such as helium and pi.
• In Search of Giant Squid - online exhibit exploring the mystery, beauty, and complexity of giant squids. Based upon material presented in the Smithsonian's National Museum of Natural History's exhibit.
• Last Word - why is the sky blue? Why does hair turn grey? Answers to readers' questions from the column in New Scientist magazine.
• Math in Daily Life - explore how math can help you in your daily life, and look at the language of numbers through common situations, such as playing games or cooking.
• Mathematician Trading Cards - get 'em, trade 'em, impress your friends and your calculus professor.
• Memory - from the Exploratorium. Explores the biological, psychological, and cultural aspects of memory, from personal experiences to breakthroughs in cognitive science.
• NASA Space Weather Bureau - current research news plus daily forecasts of solar flares and geo-magnetic storms.
• National Geographic Online - discover the Society's photos, maps, globes, magazines, worldwide expeditions, travel tips, vacation planning, and more.
• NOAA La Niña Page - information and links on the weather phenomenon characterized by unusually cold ocean temperatures in the Equatorial Pacific.
• OwlCam - follow a pair of Northern Barred Owls as they raise their family in Eastern Massachusetts. Camera and microphones inside nest box. Frequent updates.
• ParaScope - investigates, researches and reports on the most shocking stories of our time.
• Pet Center, The - go behind the scenes at an animal hospital and see surgeries, x-rays, exams, and learn about important topics like euthanasia, nutrition, breeding, and grooming.
• Pet of the Day - each day one pet is selected to be honored with a photo and story. All pets are eligible. Nominate yours for free!
• PhysLINK - contains jobs, reference, societies, journals, history of physics, new theories, ask experts, jokes, cartoons and more.
• PlanetDiary - presents weekly geological, astronomical, meteorological, biological, and environmental news from around the globe, plus Internet activities and links to science resources.
• Round Earth, Flat Maps - encounter the options available to our cartographers and the tools that help them face the challenge of portraying a round Earth on flat maps.
• SandlotScience.com - an online collection of colorful optical illusions without a lot of 'deep' science. Includes many interactive demonstrations, science projects, art, books, games, puzzles and more.
• Science of Hockey - why is ice slippery? What are the mechanics involved in skating? How much energy is generated by a mid-ice collision? Presented by the San Francisco Exploratorium and the San Jose Sharks.
• Science à GoGo - aims to reveal developments in science and technology to as wide an audience as possible.
• Shark Surfari - the cruel killers who haunt our imaginations bear little resemblance to the diverse, intelligent creatures who play a key role in the ocean ecosystem. An online quiz from National Geographic.
• Shopcat.com - dedicated to the "working" cats of the world. Pictures and stories about each featured cat.
• Solar System Simulator - simulated view of any body in the solar system from any location and time in full-color graphics. A NASA/JPL space site.
• Space Place - make a pop rocket that really works, solve a riddle, and dive beneath the surface of Mars. Do these things and more, and learn about space and astronomy at the same time.
• Stephen Hawking's Universe - explores such questions as,"where do we come from? How did the universe begin? Why is the universe the way it is? How will it end?"
• Sue at The Field Museum - learn all about the largest, most complete Tyrannosaurus rex, and how its skeleton is being prepared for display.
• Traffic Waves - physics for bored commuters.
• Turtle Satellite Tracking Program - view a regularly updated map showing the migratory movements of endangered sea turtles being tracked by satellite.
• Why is the sky dark at night? - colorful Java applets guide you through the fascinating physics problem.
• Xpeditions - discover nearly 1,800 ways to see, and print, the world.
• Your Weight On Other Worlds - ever wonder what you might weigh on Mars or the Moon? Here's your chance to find out.

Ask an Expert

• Ask Dr. Universe  - you can ask Dr. Universe almost anything. She'll go to Washington State University's team of researchers to find the answers.
• Room 103  - get your science and technology questions answered by a group of CalTech alumni.
• ScienceNet  - features answers to interesting questions relating to a broad spectrum of scientific disciplines, organized into a searchable database. The site also provides an opportunity to ask questions by email.
• Scientific American: Ask the Experts   - current and archived questions and answers in the fields of astronomy, biology, chemistry, geology, mathematics, physics, computers, environment, and medicine.
• Ask A Scientist - physics, chemistry, mathematics, computer science, polymer science, display engineering, and information management. Biology and life sciences are not their areas of expertise.
• Ask Discover Magazine - a place for answers to your questions about the world of science.
• Ask Dr. Fred - scientist, researcher, and teacher Dr. Fred Bortz will answer questions about any scientific topic that interests you.
• Ask Wendell - everything you wanted to know about science - from a worm.
• KnowWhat.com - questions and answers provide examples of scientific principles at work in everyday life, and explain why things are the way they are.
• Last Word - why is the sky blue? Why does hair turn grey? Answers to readers' questions from the column in New Scientist magazine.
• Mad Scientist Network - provides answers to science questions, edible and inedible experiments, a tour of the Visible Human Project, and an index of resources and web links.
• NEWTON BBS - a place for K-12 science, math, and computer teachers and their students to communicate. Includes the Ask A Scientist program that has fielded over 10,000 questions.
• Science Matters - a question and answer forum.
• Science Whatzit! - the Oregon Museum of Science and Industry will try to answer your science questions and stumpers that you just can't find the answers to.