Neutrino oscillations depend on two parameters: the square of the neutrino mass difference delta m2 and the mixing angle sin22θ. Experiments conducted since the 1990s are constraining the possible values of these two values. The MINOS result yields a value of delta m2 that already rivals the Super-Kamiokande and K2K results in precision: delta m2 = 0.0031 +/- 0.0006 (statistical) +/- 0.0001 (systematic) eV2. Taking more data over the coming years, the MINOS collaboration will further reduce the statistical uncertainty.