  We report the observation of CP violation in the $B^0$ meson system. Using a
novel technique for time-dependent measurements, we measure a non-zero value
for the CP-violating amplitude $\sin 2\beta$ at the 4.1 $\sigma$ level. We also
report on precision measurements of the $B^+$ and $B^0$ lifetimes and the
$B^0\bar{B}^0$ mixing frequency $\Delta m_d$ obtained with the same technique
and on a first measurement of the time-dependent CP-violating amplitude in
$B^0\to \pi^+\pi^-$ decays.
