Educational consultant and textbook author Jill Britton is the author of these metasites listing Web resources for grade 5-8 mathematics. Each metasite revolves around a certain topic. The third metasite listed here focuses on polyhedra with activities ranging from creating three-dimensional polyhedra with gumdrops and toothpicks to examining Ernst Haeckel's nineteenth-century sketches of polyhedral structure of Radiolaria (a plankton). Other types of links given on these pages are to merchants selling educational materials, sites on the history of mathematics, and activities with holiday themes.