The U.S. Defence Advanced Researh Projects Agency--aka DARPA aka The Guys Who Run Area 51 and Have a Pact with the Aliens to Abduct the Entire Human Race in 2012--has turned its eyes to coal for aeroplane fuel. There's only one problem: coal-to-liquid fuel technologies are too expensive and produce too much pollution. Until now.

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The USAF keeps pushing forward the race towards cleaner skies--and leaner warmachine and potential global mayhem costs--moving from pure oil-derived fuel to a mixture between oil and synthetic fuel. The new benchmark is not a B1 bomber, which they already put through its paces using a similar mix, but a fighter jet: They broke the Mach 2 barrier using the new fuel mix in an F-15, which according to the Air Force is a crucial step:

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