Two Italian scientists claim to have successfully developed a cold fusion reactor that produces 12,400 watts of heat power per 400 watts of input. Not only that, but they'll be commercially available in just three months. Cold fusion is a tricky business -- some say a theoretically implausible business. Hypothetically (and broadly) speaking, the process involves fusing two smaller atomic nuclei together into a larger nucleus, a process that releases massive amounts of energy. If harnessed, cold fusion could provide cheap and nearly limitless energy with no radioactive byproduct or massive carbon emissions. Andrea Rossi and Sergio Focardi claim [their reactor] fuses atomic nuclei of nickel and hydrogen using about 1,000 watts of electricity which, after a few minutes, is reduced to an input of just 400 watts. This reaction purportedly can turn 292 grams of 68 degree water into turbine-turning steam -- a process that would normally require 12,400 watts of electricity, netting them a power gain of about 12,000 watts. They say that commercially scaled, their process could generate eight units of output per unit of input and would cost roughly one penny per kilowatt-hour, drastically cheaper than your average coal plant.