My coworkers and I have shown that if the QCD phase transition, at about T=150 MeV, is first order, the bubble nucleation and collisions would produce magnetic effects, which would give polarization correlations of the Cosmic Microwave Background Radiation distinct from those predicted by other theoretical cosmological studies. The Electroweak phase transition at T=Higgs Mass is first order in the minimal supersymmetric model, with the mass of the stop (partner of the top quark) being of the order of the Higgs. Applying this theory we are studying magnetic fields generated during the EW phase transition as seeds for galactic magnetic fields.