Extensions to Physics: What Cold Fusion Teaches

This article documents some condensed matter nuclear science work where contemporary physics models are re-examined, extended and/or supplemented. Primarily for DD fusion: (1) ability of two low-energy protons or deuterons to penetrate their mutual Coulomb barrier; (2) production of heat far in excess of that possible based on the measured particulate radiation; (3) high levels of ⁴He measured; (4) enhanced coupling of nuclear energy to local lattice; (5) transmutation, and (6) selective 'scavenging' of radionuclides in the lattice have been explained in terms of several extended physics models. More than sufficient evidence now proves that low energy nuclear reactions occur and lead forward.