Author Alexander Calandra is now Professor Emeritus(荣誉退休)of Physical Scienes 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. Alexander Calandra is now Professor of Emeritus ( 荣 誉 退 休) 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. Author