Although Exploratorium has been previously highlighted several times, the Online Exhibits Web site compiles old and new activities on a single well designed interactive page. From here, students can choose from topics such as seeing, mind, life science, matter/ world, and hearing categories; and then partake in the many activities within each. For example, the squirming palm activity uses Shockwave to spin dots in a direction and tells you to look at your palm after 15 seconds to see that it appears to be rotating in the opposite direction.