Lesson 5-Angels on a Pin . Author Alexander Calandra is now professor of Emeritus of Physical Sciences at Washington University in St Louis, Missouri. The present text is adapted from Angels on the head of a pin: A Modern Parable"which first appeared in Saturday Review. Dec 21, 1968 and has, since then become a classic Cor an often quoted) case on the problems of American education. W BTL E The end of authorW B T L E Lesson 5—Angels on a Pin Alexander Calandra is now Professor of Emeritus of Physical Sciences at Washington University in St. Louis, Missouri. The present text is adapted from “Angels on the Head of a Pin: A Modern Parable” which first appeared in Saturday Review. Dec. 21, 1968 and has, since then, become a classic (or an often quoted) case on the problems of American education. I. Author The end of Author