Test your knowledge of Helium
Trapped within a subterranean expanse of porous rock near Amarillo, Tex., is the world's largest supply of helium, the Federal Helium Reserve.
The U.S. government is on track to sell the last of this stockpile within five years and let the private sector control the market.
But some scientists fear that within a few decades, there may not be any helium to control. In fact, they say we're close to running out of the second most common element in the universe. (In our solar system, most helium is inside the sun.) Read the full story.
October 11, 2010; 5:40 PM ET
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