  In the past year, we calculated with lattice QCD three quantities that were
unknown or poorly known. They are the $q^2$ dependence of the form factor in
semileptonic $D\to Kl\nu$ decay, the decay constant of the $D$ meson, and the
mass of the $B_c$ meson. In this talk, we summarize these calculations, with
emphasis on their (subsequent) confirmation by experiments.
