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50 CHALLENGE SERIES terns, which are known as free radicals, either kill or seriously damage living cells. The how and why of both the particles and the damage they cause is the topic of this film. A CHEMICAL SOMERSAULT (1965). A commonly accepted scientific maxim, that the inert gases will not form chemical compounds, is shown to be false in this film depicting some of the research of the Argonne fluorine chemis- try group. The making of xenon-fluorine compounds is illustrated with laboratory equipment. Research into structures of mole- cules of these compounds is shown and explained. DOWN ON THE FARM (1965). Algae are grown in heavy water in a unique "farm" at Argonne to obtain organic compounds in which the atoms of ordinary hy- drogen are replaced by atoms of deuterium. Scientists show how these deuterated compounds are employed in studies of photo- synthesis and other metabolic processes. The presence of deu- terium in place of ordinary hydrogen is shown to have a slowing - down effect on many life processes. FOUNDATIONS FOR THE FUTURE (1962). Problems that are still to be solved by nuclear scientists are discussed in this film. Areas of particular interest to the scien- tist in his work now and in the future are identified as being the effects of radiation, the peaceful uses of radiation, and the dan- gers of radiation. THE FUEL OF THE FUTURE (1965). Special precautions and techniques employed in working with Plutonium are shown in a unique engineering laboratory, the Argonne Fuel Fabrication Facility, where work is performed within sealed glove boxes under an inert atmosphere. The man- ufacture of experimental reactor fuel pins containing plutonium is illustrated step-by-step. HARNESSING THE RAINBOW (1965). Uses of spectroscopy in a nuclear laboratory are illustrated with instruments ranging in complexity from a simple prism to one of the world's largest and most complex light spectrographs. Ar- gonne scientists describe the identification of line spectra as a means of studying atomic structure. THE IMMUNE RESPONSE (1962). This film is concerned with the mechanism by which the body