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52 CHALLENGE SERIES are passed on to succeeding generations. Mutation research is illustrated with results of experimentation on generations of mice and includes discussion of work with fruit flies and induced mutations. Fallout and its implications are also discussed. SEARCHING FOR THE ULTIMATE (1962). Atomic structure, one of the most basic forms of nuclear re- search, permits the scientist to discover the nature of the uni- verse through the use of atom smashers or particle accelerators. The machines produce intense beams of radiation which enable study of the structure of the atom, the nucleus, and the basic components of the nucleus. This film explains how accelerators operate and shows one of the world's largest particle accelera- tors being constructed. Sub-nuclear particles and the concept of matter and anti-matter are also explained. TESTING FOR TOMORROW (1965). Aspects of nondestructive testing as employed in a nuclear lab- oratory, are depicted. Among the techniques, many of them newly developed, are neutron radiography, eddy current testing, ultra- sonic detection of voids, and ultrasonic television scanning. TIME —THE SUREST POISON (1962). This film explores the natural process of aging and the methods used in its study. Aging might be considered one of the deleteri- ous side effects of radiation since radiation injury resembles natural aging in so many ways. Results of study of the aging process involving the use of radiation are presented. The con- duct of research on animals using low-level gamma irradiation is illustrated. TRACING AIRBORNE RADIOACTIVITY (1962). The principle of air being able to cleanse itself of poisonous substances, including those which are radioactive, is covered in this film. Atmospheric fallout and methods now being used to determine and study such fallout are examined. Fallout studies are discussed which relate man and his environment. TRACING LIVING CELLS (1962). Radioactivity is often mankind's servant. In recent years, the use of radioactive isotopes in the study of cell division and in medi- cal therapy has helped man overcome disease. This film demon- strates some of the many helpful and healthful uses of atomic energy, including use of radioactive tracers in blood and cancer research.