The intergalactic medium (IGM) exhibits pervasive magnetic fields with strengths of approximately 10^-16 to 10^-15 Gauss, extending across vast cosmic voids and filaments far from any obvious astrophysical sources like galaxies or active galactic nuclei. Lambda-CDM, combined with standard Big Bang nucleosynthesis, provides no natural mechanism to generate these seed magnetic fields in the early universe, as the primordial plasma should have been electrically neutral after recombination with no large-scale currents or dynamos (Widrow 2002; Durrer & Neronov 2013). While various exotic mechanisms have been proposed—ranging from phase transitions in the early universe to battery effects during structure formation—none can convincingly explain the observed field strengths, coherence lengths, and nearly uniform distribution across the cosmic web without invoking new physics or fine-tuned initial conditions. The presence of these fields suggests that the IGM has a more dynamically violent history than Lambda-CDM allows.