High Quality Content by WIKIPEDIA articles! Cold fusion, also called low-energy nuclear reaction (LENR), refers to the hypothesis that nuclear fusion might explain the results of a group of experiments conducted at ordinary temperatures (e.g., room temperature). Both the experimental results and the hypothesis are disputed. The ideas gained attention after the reports of Martin Fleischmann, then one of the world`s leading electrochemists, and Stanley Pons in 1989 that they had produced anomalous heat ("excess heat") of a magnitude they asserted would defy explanation except in terms of nuclear processes. They further reported measuring small amounts of nuclear reaction byproducts, including neutrons and tritium. The small tabletop experiment involved electrolysis of heavy water on the surface of a palladium (Pd) electrode.