Part of the Common Molecules Collection, this set of 3D biochemical molecule images is an educational feature from Reciprocal Net, a Web portal for crystallography research funded by the National Science Foundation and part of NSDL. The Common Molecules Collection currently offers a number of image galleries, but only a couple -- including the biochemical molecules set -- with direct life sciences application. Users can view and rotate a 3D image for each molecule provided (organized by amino acids, hormones, and nucleosides), accompanied by a brief explanation and other particulars such as chemical formula. It's a great tool for visual learners and a fun Web site to visit just for the 3D effects.