The measurements of the Bd oscillation frequency in 1987 allowed theorists to set a lower limit on the top quark mass which was much higher than expected. The direct measurements of the top quark mass in 1995 confirmed this prediction. A curious property of the B mixing is the sensitivity to the particles with masses up to 100 TeV which cannot yet be observed directly. It took many years after observation of the Bd mixing to reach a sensitivity appropriate for tests of the predicted Bs oscillation frequency. Using large semileptonic Bs samples collected with the D0 Detector (Fermilab) we have reached a very good sensitivity to the Bs oscillations. The D0 prospects for the Bs mixing measurements will be discussed as well.

Neutrino cross-section measurements as well as precision measurements of neutrino mixing angles and mass differences depend heavily on neutrino flux calculations. Such calculations rely on hadron-nucleus interaction cross-section data, and yet the data are scarce. The Main Injector Particle Production (MIPP) experiment at Fermilab, currently in-progress and collecting data, is a full acceptance spectrometer with excellent particle identification abilities. MIPP aims to provide a comprehensive hadron production data set for $p$'s, $\pi$'s and $K$'s at various momenta (from 5 to 120 GeV) on several targets including beryllium and carbon. In particular, MIPP has collected hadron production data on the actual MINOS target using 120 GeV/c protons from the Main Injector. I will review the physics goals, detectors and status of the experiment.

Violations of Lorentz symmetry provide a potential signal for new physics at the Planck scale. At our present energy scales, general Lorentz violation is described by the Standard-Model Extension (SME). In this talk, I will review the SME and describe a new sensitivity to Lorentz violation that is attainable in experiment, arising from gravitational interactions with fermions.