Dr. Frank Potter has been crafting and refining his science gems website since 1994. It currently contains over 14,000 science resources sorted by category, subcategory, and grade level, and it's still a work in progress. Visitors should take a look at the "K-16 Science Gems for the Classroom" area complete with subsections on Physical Science, Earth Science, and Life Science. Each of these subsections is divided into smaller areas by grade level and each entry has a brief description of the resource in question. Visitors can also use the Additional Class Resources for more resources, such as the "Great Sciences Discoveries of the 1990s" section and other hidden gems.