In 1989, electrochemists Martin Fleischmann and Stanley Pons announced they had achieved nuclear fusion in a tabletop electrochemical cell at room temperature, producing excess energy.
Cold fusion was hailed as a potential clean energy breakthrough, but subsequent attempts to replicate the results failed across independent laboratories worldwide. The initial claims were based on flawed calorimetry and misidentified energy signatures. While some fringe research continues, the scientific consensus is that the original cold fusion claims were false, and there is no viable room-temperature fusion process. This became a case study in the importance of peer review and independent verification.