Scientists have come a long, long way since Alexander Fleming’s discovery of penicillin, the wonder drug of the 20th century. This program explains the function of infection-fighting antibiotics; vaccinations and insulin, crucial to the prevention of diseases such as smallpox and the management of diabetes; recombinant drugs, treatments involving genetically engineered DNA; and stem cells, those chameleon-like building blocks of the body. Commentary is provided by Drs. James Baker, Brian Athey, and Elliott Hill, of the University of Michigan; Susanne Kleff, of MBI International; and Bob Forgey, of ProNAi Therapeutics. A Films for the Humanities & Sciences Production. (24 minutes)