Since Russia and the U.S. signed a partial test-ban treaty in 1963, their blasts have been deep below the earth's surface.

CNN: ASIANOW - Asiaweek

Those fissures and crevices that have trapped natural gas below the Earth's surface are also capable of trapping helium, although typically in small amounts.

CNN: U.S. needs a strategy on helium

Pricing 150, 000 equity options in a second or assessing how much crude oil sits in a pocket 6 miles below the earth's surface are massively parallel mathematical computing problems for which graphics processors are peculiarly equipped.

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