Dr. Waring, vice president of the Davison Chemical Co. in Baltimore, MD, defines a catalyst as a substance that when added to a chemical reaction either speeds it up or causes it to take place at a lower temperature. He offers the example of a sugar cube held in a flame, which will not burn unless potash from a cigarette ash is added. Commercial applications of catalysis include petroleum refining, converting distilled crude oil into transportation fuels and other petroleum-based products. Dr. Waring shows a model of the catalyst cracker and describes the cracking process in petroleum refining. An animated film shows what takes place in the reforming part of the process in which the molecular structure of the petroleum is changed to alter its combustion characteristics and thus alleviate knocking in automobile engines. Platinum is the catalyst in the reforming process. Dr. Waring notes that the silica gel developed and patented in 1919 by Johns Hopkins scientist D. Walter A. Patrick is the base for many catalytic materials. Other catalyst include vinyls which are used to make plastics.

On this program about forensic medicine, Dr. Guerin, from the Maryland State Medical Examiner's Office, describes the case of a body found in a burned house and shows photographs of forensic evidence to prove this was not a homicide. By comparing a series of skulls, Dr. Guerin explains how to determine the age of the victim by examining the suture lines and the sex by looking at the nasal ridges and angle. The sex can also be determined by the pelvic bones, and the height can be computed by measurement of long bones such as the femur. Thus, knowledge of anthropology, anatomy, and radiology are necessary for forensic scientists. Dr. Freimuth discusses the chemistry of forensic science and performs chemical tests to determine the presence of arsenic in the death of a child. Dr. Lovitt points out that twenty percent of all Maryland state deaths need to be investigated. This often involves autopsies for courtroom evidence. He gives examples of cases, and he diagrams a congenital aneurysm, which led to hemorrhaging and caused sudden death by natural causes. Dr. Fisher discusses that gunshots are the most common method of homicide and shows how bullets and shotgun blasts leave patterns of damage in the body.

Dr. Witt defines water surface tension and shows examples of "wetted water." His daughter Marilyn performs an experiment floating a steel needle on water until an additional drop of water breaks the surface tension and sinks the needle. Dr. Witt demonstrates how the surface of a glass plate treated with a wetting agent stays clear and unfogged as the water spreads into a thin film, unlike the untreated surface, on which droplets formed spheres that cloud the glass. This technology is used on skin diving masks and windshields of airplanes and cars. Dr. Witt compares "wetted water" and regular water in laundry uses. Wetting agents also allow mixing of oil with water to make stable emulsions for such products as agricultural sprays, paints and dyes, cosmetics, and floor waxes. In addition to synthetic wetting agents, there are also natural ones such as egg yolks. Dr. Witt shows how a warm carbonated beverage, as an unburnable emulsion, can be used as a fire extinguisher to put out small fires.

Lynn Poole shows an artist's rendition of tic douloureux or trigeminal neuralgia, and Dr. Smith describes this pain of the fifth cranial nerve. A sketch of the head shows the three nerve divisions in the face, and an electrical model traces the nerve's pain transmittal to the brain. The causes of this affliction are unknown and the occurrences unpredictable although the painful attacks often occur from eating, talking, or touching the face. This is a disease of advancing years, and Dr. Smith interviews an elderly patient, Mrs. White, who attempts to describe her symptoms until orifacial pain overcomes her. As early as the 1500s treatments included surgery to cut the nerve. This is still performed, and Dr. Smith interviews Mrs. Frank, who received such surgery and now has no sensation of pain at all in one side of her face, as evidenced by the doctor sticking a pin into her cheek. Other remedies now include chemically damaging the nerve by injecting it with alcohol or novocaine, cutting the fiber track.

At the beginning of this last episode of the Johns Hopkins Science Review, John H. Fisher, superintendent of public instruction for Baltimore City, presents Lynn Poole with a citation from the National Citizens' Committee on Educational Television. Mr. Poole points out that in 1948, when this series began, there were only 22 television stations and 250,000 receiving sets nationwide. Now, in 1955, there are 423 stations and 36 million television sets. He spends the remainder of the program thanking the people who made it possible: the scientists from Johns Hopkins and other institutions who took a chance on being on television and who revealed their new discoveries, such as Dr. Arthur Parpart's vidicon camera; the teachers who included in their lesson plans the show's demonstrations of complex subjects, such as an atomic chain reaction represented by 100 mousetraps; industry, one of which credited the show with duct system design inspiration; foreign countries, such as England, France, and Canada, where many new scientific developments are taking place.

A film shows scenes of water recreation and sporting activities such as fishing, boating, walking in waterfront parks, and swimming. The film notes that infections and drowning are the primary dangers of swimming and that with the growth of safe pool facilities with lifeguards, swimmers can learn proper swimming techniques. Lynn Poole pays tribute to the YMCA, pioneers in teaching swimming and water safety. Lou Martin, Baltimore YMCA's aquatic director, explains and demonstrates the Holger-Nielsen (arm lift, back pressure) manual method of artificial respiration. The equipment used in the mechanical method is then demonstrated by Martin McMann of the Baltimore City police.

Lynn Poole points out that science is often used in crime detection, as when Johns Hopkins physicist Robert W. Wood used ultra violet light to help police solve such crimes as the "candy box murder." Lieutenant Nelligan, Director of the Baltimore City Crime Lab, says that a criminalist, or scientific crime detective, requires a background in both science and police techniques. A dramatization follows the investigation of a fictitious crime, a burglary in a suburban house, to demonstrate the basic tools used to solve the crime: a microscope to match hairs and fibers, a spectrograph to analyze metals and glass, a vacuum cleaner to pick up evidence in a special filter, and a magnifying glass to enlarge details. The density gradient test is also demonstrated and explained. The cast for the scene is from Baltimore's Hilltop Theater: Caddell Burroughs, Elaine Swann, Earl Simmons, John Holland, Alex Quiroga, and Buff Shurr.

Dr. Lee explains the research being carried out by the U.S. Dept. of Agriculture's Dairy Husbandry Research Branch on milk production in tropical climates. He says that of the two major milk cow groups, the European cattle offer high milk production but low resistance to a hot environment and the native Indian humped cattle are the opposite. In addition to breeding the most heat resistant European cows and selecting the native cattle with the highest milk production for breeding, the Dept. of Agriculture is cross breeding Jersey cows and Sindhi cows. The research results seem to show that a cow that is 5/8 native Sindhi has the best combination of heat tolerance and milk production. In a film of the heat room, Mr. McDowell explains experiments which measure the cows' sweat and their respiratory cooling. He also notes that the color and thickness of a cow's coat and its blood flow to the skin are possible determinants in heat adaptation.

Due to studio difficulties, there is no sound track on this program for the first few minutes. Dr. Schwartz displays some of the creatures brought from Cook's Pond near Blairstown, NJ: a painted turtle, a bullfrog, a tree frog, and an aquarium of pond water with a variety of fish, insects, plants, and tadpoles, all part of the web of life. He then describes smaller pond organisms (hydra, damsel fly nymph, and planaria) that he shows viewers under a television microscope he developed.

Lynn Poole shows photos and demonstrations from past programs and poses questions for viewers on the topics of skin grafting, atoms, electroencephalography, x-rays, and diffraction grating. Afterwards he gives the answers with explanations. Next a series of six simple experiments are performed, questions are asked about each, and answers are given afterwards. The experiments' concepts include molecular model identification, cold steam power, surface tension disruption, carbon dioxide production, and interaction of acetone with acetate rayon.