Audio recording of session J15 of the April 2012 annual meeting of the American Physical Society, held in Atlanta, GA in March-April 2012. This session was sponsored by the Forum on the History of Physics (FHP) and chaired by Adrienne Kolb of Fermi National Accelerator Laboratory. Talks (and speakers) include: "On the Late Invention of the Gyroscope" (Kenneth Brecher); "Sommerfeld's balancing act with Einstein: The geometry of relativistic velocity space" (Felix T. Smith); "Francis Perrin's 1939 Analysis of Uranium Criticality" (Cameron Reed); "Babson, Bahnson, the DeWitts and the General Relativity Renaissance" (Hamilton Carter); "Who was Christine Shack?" (Ronald E. Mickens); "Black Holes: are they as real as we think?" (John Laubenstein); "Online and Blended Climate Change Courses for Secondary School Educators from the American Museum of Natural History" (Robert Steiner); "Learning Physics from the Real World by Direct Observation" (Saami J. Shaibani); "Teaching the Maxwell and Dirac Equations in the Same Algebra" (Gene McClellan). Topics discussed include gyroscopes, Jean-Bernard-Leon Foucault, Herman Minkowski, Arnold Sommerfeld, Albert Einstein, geometry, relativistic velocity, Francis Perrin, uranium, Robert Serber, general relativity research, Agnew Bahson, Roger Babson, Institute of Field Physics at the University of North Carolina, Chapel Hill, Cecile and Bryce DeWitt, Higgs boson, Christine Shack, Project Matterhorn, black holes, American Museum of Natural History (AMNH), climate change education courses, teaching physics through direct observation, Maxwell's equations, and the Dirac equation.