Cold fusion, better known by its practitioners as LENR, is the science?"or, perhaps, the art?"of making atomic nuclei merge and, ideally, harnessing the resultant energy. All of this happens without the incredible temperatures, on the scale of millions of degrees, that you need for "traditional" fusion. In a dream world, successful cold fusion could provide us with a boundless supply of clean, easily attainable energy. Tantalizing as it sounds, for the past 30 years, cold fusion has largely been a forgotten specter of one of science's most notorious controversies, when a pair of chemists in 1989 claimed to achieve the feat?"which no one else could replicate. There is still no generally accepted theory that supports cold fusion; many still doubt that it's possible at all. But those physicists and engineers who work on LENR believe the new grant