Medical research has been a major underlying factor leading to the dramatic reduction in overall morbidity and mortality in the 20th century. In his book, The Devil Under the Microscope, Thomas Hagar describes the discovery of sulfa drugs and the first observations of the effects of Penicillium fungi on bacteria. Jim Vrbanac at MPI Research discusses the science of drugs, pharmacology, and how this is divided into two distinct, separate but interactive domains: dynamics and kinetics.