
According to New Scientist, humans produce 10 billion liters of urine each day—enough to power the world. And with gas prices on their way to $4 a gallon again, it's time to come up with truly alternative resources.

Gerardine Botte, a professor of chemical and biomolecular engineering, says that two compounds in urine, ammonia and urea, could be a source of hydrogen, which would power specially adapted cars. The fill-up process sounds a little unpleasant, but imagine making a roadstop and emptying your personal tank to fill up your Jeep. Sweet!
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