Museum sites sometimes just mimic their offline counterparts. Not the Exploratorium, the online home of the museum of science, art and human perception in San Francisco. The Exploratorium includes a host of online exhibits and experiments, many of them making use of the latest in web technologies. You want to learn about faultlines? Sunspots? Pinhole projectors? Here’s where you’ll learn it all—and lots more. Including links to over 18,000 pages containing info on hundreds of topics, visitors won’t walk away empty-handed. And even though it’s only an online site for the Exploratorium, you can partake in interactive learning with online versions of museum exhibits. This site is just waiting to be explored.