  Because of the top quark's very large mass, about 175~GeV, it now provides
the best window into flavor physics. Thus, pair--production of top quarks at
the Tevatron Collider is the best probe of this physics until the Large Hadron
Collider turns on in the next century. I discuss aspects of the mass and
angular distributions that can be measured in $\ttb$ production with the coming
large data samples from the Tevatron and even larger ones from the LHC.
