I appreciated the following suggestion about virtual samples, "At last count, there is not one best repository of such virtual samples, but MERLOT (Multimedia Educational Resource for Learning and Online Teaching), a well-known repository of reusable learning objects, can provide a starting place for instructors. MERLOT provides access to useful and validated digital artifacts that can be used by instructors free of charge. Another resource which may beneficial to instructors is located at the Science Education Resource Center at Carleton University (SERC). This Web site is a clearinghouse of stimulating online lab activities and samples in the areas of geological… >>>