Low Energy Nuclear Reactions (LENR)- finally getting some coverage.
This Sci Am blog is the tip of a large iceberg. There has been a great deal of credible research in low temperature nuclear reactions since 1989, and overwhelming evidence that energy is released on a scale that cannot be explained by chemistry alone.
The Widom-Larsen theory is just one possible explanation. All the theories have promise, and all have problems. W-L theory explains how nuclear reactions can occur at or near room temperature through the creation of ultra-low-momentum neutrons and subsequent neutron-capture processes. Such neutrons, according to the theory, have a very large DeBroglie wavelength and therefore have a huge capture cross-section, explaining why so few neutrons are detected. But the problem in explaining how these neutrons can form is just as formidable as problems in explaining fusion.