This portrait of the father of the Periodic Table of Elements shows an extremely intelligent and intuitive scientist who was an energetic popularizer of science and took a strong interest in finding practical uses for the conclusions of abstract science. The program explains the thought-processes that led to his understanding of the relationships between families of elements and his prediction of the existence of other elements—a man of boundless drive and intellectual curiosity, a child of the 19th century, and a father of scientific method. (28 minutes)