But the gas-seals would be perfect if the pistons were liquid rather than solid.

ECONOMIST: An engine made of water

This "perfect storm" between facility issues and lower natural gas production overseas has caused a shortage in helium worldwide.

CNN: Don't deflate the party

In fact, it's not far-fetched to imagine a perfect storm in which low-priced oil coincides with climbing natural gas prices just as a drought hits the Midwest, ravaging the corn crop.

FORBES: Ethanol Gusher!

The designer's modern, minimal creations furnish the narrow, two-storey cafe, and a few of his works are also on sale, including a ceramic coffee roaster shaped like a gourd that works on an ordinary gas range, should you be inspired to brew your own perfect cup.

BBC: Kyoto��s coffee culture

If the fuels were perfect substitutes, oil prices would thus tend to be about 6 times natural gas prices.

FORBES: Oil And Natural Gas Prices Get Divorced

However, since natural gas extraction from shale deposits is an expensive process, it makes perfect sense for the company to invest in distribution networks to spur the demand for the fuel.

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