Svante August Arrhenius was awarded the 1903 Nobel Prize in chemistry for his research on the theory of electrolytic dissociation, a theory that had won the lowest possible passing grade for his Ph.D. two decades earlier. Arrhenius's work with chemistry was often closely tied to the science of physics, so much so that the Nobel committee was not sure in which of the two fields to make the 1903 award. In fact, Arrhenius is regarded as one of the founders of physical chemistry--the field of science in which physical laws are used to explain chemical phenomena. In the last decades of his life, Arrhenius became interested in theories of the origin of life on Earth, arguing that life had arrived on our planet by means of spores blown through space from other inhabited worlds. He was also one of the first scientists to study the heat-trapping ability of carbon...