  An anomaly is said to occur when a symmetry that is valid classically becomes
broken as a result of quantization. Although most manifestations of this
phenomenon are in the context of quantum field theory, there are at least two
cases in quantum mechanics--the two dimensional delta function interaction and
the 1/r^2 potential. The former has been treated in this journal; in this
article we discuss the physics of the latter together with experimental
consequences.
