Cold fusion is a hypothesized type of nuclear reaction that would occur at, or near, room temperature. It would contrast starkly with the "hot" fusion that is known to take place naturally within stars, where it takes place at about 27,000,000° F. Cold fusion was first claimed to have been achieved in 1989 by chemists Stanley Pons and Martin Fleischmann, who reported that when they ran electricity through a metal rod immersed in heavy water, it produced far more energy than they could account for through known chemical interactions. They detected stray neutrons near the apparatus, another telltale sign of fusion. However, their peers were skeptical, and no one else could reliably replicate their results. Since then, some interest in cold fusion has continued through the decades, and a small community of researchers continues to investigate it, often under the alternative designations low-energy nuclear reactions (LENR) or condensed matter nuclear science (CMNS) . Cold fusion devices are typically small table-top laboratory experiments, ranging in size from tiny test-tubes to small refrigerator-sized generators. In spite of the relatively small size of the cells, the cold fusion reaction produces so much heat, it is more than can be accounted for by chemical means, and therefore must be some type of new nuclear mechanism, for cold fusion is not like today’s dirty and dangerous nuclear power. Cold fusion is also referred to as the Anomalous Heat Effect (AHE), reflecting the fact that there is no definitive theory of the elusive reaction.