As late as 1967, smallpox struck as many as 15 million people in 43 countries and killed an estimated two or three million. Experts now believe that the disease is on the verge of extinction. NOVA looks at the recent success of the World Health Organization's program to eradicate this disease, considered a triumph of western-styled medicine.

Recent scientific developments have made it possible to detect a wide variety of defects in unborn babies. NOVA focuses on the ethical question that must be considered: What defines a defect? Should defective babies be aborted, or should they be allowed to live?