Sphaleron-mediated baryogenesis models imply a remarkable connection between primordial magnetic helicity and baryon number density. The observed baryon number density then implies a primordial magnetic field at the present epoch which can be of nano Gauss strength with coherence scale on the order of parsecs. If time permits, I will also discuss radio bursts as a promising way to look for superconducting cosmic strings in light of the recent spark observed by Lorimer et al.