The author is Professor Emeritus of Physics at Yale University. Over a period of thirty years, he taught Physics to more than one thousand students including non-science majors and graduate students. These vignettes cover aspects of his lectures that deal with the essential connection between Special Relativity and Quantum Mechanics that is the result of the fundamental concept of particle-wave duality, introduced by deBroglie. It is the tradition to teach these two major branches of Physics as separate subjects so that the connection, emphasized here, is too easily missed.