This week, scientists gathered at the American Chemical Society's spring meeting in San Francisco to turn the spotlight on a highly unorthodox path: the effect known as cold fusion. This year's session featured nearly 50 presentations - including reports on batteries and bacteria that appear to exhibit the cold-fusion effect. Back in 1989, cold fusion was heralded as a simple, inexpensive way to get a power-generating fusion reaction on a desktop. But when the experimental results couldn't be reproduced, the researchers were driven into obscurity [and] the term "cold fusion" became synonymous with quackery. Chemists, however, have kept up their interest in the effect. Rick Nebel [has headed] up a handful of researchers following the less-traveled path to fusion at EMC2 Fusion Development Corp. EMC2 recently created a buzz in the fusion underground by reporting on its Web site that it successfully completed a series of experiments to "validate and extend" earlier results. The company is now using a $7.9 million contract from the U.S. Navy to build a bigger test machine. Nebel and his colleagues are now seeking contributions to fund the development of what they say would be a 100-megawatt fusion plant - a "Phase 3" effort projected to cost $200 million and take four years. "Successful Phase 3 marks the end of fossil fuels," the Web site proclaims.