Martin Fleischmann and Stanley Pons: Cold fusion. It’s an electrolytic cell with heavy water (i.e., deuterium) and salts, and two electrodes, one of which is palladium. By passing an electric current through it, the hydrogen in one electrode apparently fuses, but the experiment won’t be reproducible in other laboratories—though this will remain controversial—but it certainly won’t be reproducible on a large scale, enough to produce a significant amount of energy.
