vrmlguy writes: "In ten years, the National Helium Reserve will be depleted, according to an article in the St. Louis Post Dispatch. An article in Science Daily echoes the concern, quoting Dr. Lee Sobotka, of Washington University in St. Louis: "Helium is non-renewable and irreplaceable. Its properties are unique and unlike hydrocarbon fuels (natural gas or oil), there are no biosynthetic ways to make an alternative to helium. All should make better efforts to recycle it." On Earth, Helium is found mixed with natural gas, but few producers capture it. The US created a stockpile in 1925 for use by military dirigibles, but stopped stockpiling it in 1995 as a cost-saving measure."