By Castelvecchi, Davide Bond lengths are different in heavy, light water molecules Heavy water is not just heavier. Swapping each H in H2O with a D- hydrogen's isotope deuterium - changes water's properties.

By Andrew Eder, The Knoxville News-Sentinel, Tenn. Feb. 1--Using material from a TVA nuclear plant, a federal facility in South Carolina today will introduce to the nation's nuclear weapons supply chain the first tritium gas produced in the United States in nearly 20 years.

Text of interview with Eduardo Messi, president of

By Mark John BRUSSELS (Reuters) - Iranian agents have tried to obtain from South Korea a substance that can be used to boost nuclear explosions in atomic weapons, an Iranian exile group said on Thursday.