title: A tale of three princes and two physicists--the importance of "why?".
authors.affiliation: Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania 19104-4283, USA. Sucher@xrt.upenn.edu
authors.forename: Giulio J
authors.initials: GJ
authors.lastname: D'Angio
authors.forename: Peter C
authors.initials: PC
authors.lastname: Adamson
mesh_terms: D005060:Europe; D049672:History, 19th Century; D049673:History, 20th Century; D008495:Medical Oncology / Q000266:history*; D010600:Pharmacology / Q000266:history; D011871:Radiology / Q000266:history*; D012106:Research / Q000266:history*; D014481:United States