Can you imagine a future where your car is fueled by iron powder instead of gasoline? Metal powders, produced using clean primary energy sources, could provide a more viable long-term replacement for fossil fuels than other widely discussed alternatives, such as hydrogen, biofuels or batteries, according to a study in the Dec. 15 issue of the journal Applied Energy. "Technologies to generate clean electricity -- primarily solar and wind power -- are being developed rapidly; but we can't use that electricity for many of the things that oil and gas are used for today, such as transportation and global energy...