  The Run I experiments at the Fermilab Tevatron Collider discovered the top
quark and provided first measurements of many of its properties. Run II (and
eventually the LHC and NLC experiments) promise to extend our knowledge of the
top quark significantly. Understanding the top quark's large mass, and indeed
the origin of all mass, appears to require physics beyond the Standard Model.
Thus, the top quark may have unusual properties accessible to upcoming
experiments.
