The U.S. Department of Energy has been handing out quite a few grants for alternative energy research recently (see links below). But if you had your hands on the purse strings, where would you send the funds?

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What is the best way to spend the DOE's money
Engine / drive-train advancement
Emissions reduction techniques
Ultra-light vehicle construction
Lithium Ion battery technology
Algae biodiesel production
Cellulosic ethanol
On-the-fly hydrogen production
Solar photovoltaics
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