User:Mba13

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A mathematician walks into a bar and asks for ten times the normal number of drinks anyone else has. "Wow," says the barkeep, "That's an order of magnitude."

Energy is main topic in the 'Grand Challenges of Engineering', Bruno De Wachter, The Leonardo Energy Initiative, updated 12 April 2008, accessed 14 September 2009 (Energy-Related Grand Challenges)