 The first feature in this series entry shows how topographical maps of remote areas of the United States are produced. Initially, hundreds of photographs of the area are taken with four special cameras using large-format film. The photographs are then painstakingly assembled so that a large, single photo can be produced. The next story shows a few modern bathroom. conveniences. Next, oddball inventor  Russell E. Oakes  (qv) demonstrates a set of "double decker" false teeth and a nose filter that renders onion fumes harmless. In the final story, Dr.  Joseph M. Hill  (qv), of Baylor University Hospital, demonstrates the process he invented for dehydrating blood serum. The crystalized serum can be stored almost indefinitely without being refrigerated.