Some day hydrogen may replace the gasoline that we are now using up so rapidly. NOVA looks at the potential of hydrogen as a zero-pollution fuel.

Health care is the third largest industry in the US. As a result of billions of dollars spent for medical education in the 1960s, there are now too many specialists and too few primary care physicians, especially in underserved areas. NOVA tells the story of one medical school in Israel that is training a new kind of family doctor.