Realizing the potential of quarkonium Available to Purchase

I recall the development of quarkonium quantum mechanics after the discovery of Υ. I emphasize the empirical approach to determining the force between quarks from the properties of $cc̄$ and $bb̄$ bound states. I review the application of scaling laws, semiclassical methods, theorems and near-theorems, and inverse-scattering techniques. I look forward to the next quarkonium spectroscopy in the $Bc$ system.