July 17, 2011 3:04 PM

Last U.S. Federal Helium Reserve is running out

Deep beneath the dry, dusty ground in the Texas Panhandle lies something lighter than air: helium. But the supply of the gas that inflates balloons, cools MRI machines and detects leaks in NASA space shuttle fuel tanks isn't infinite. There's only so much helium in the world, and some fear that a shortage is coming.

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