OT: energy consumption. While white paint might help, the environmental costs for using the computer is great and going to get greater. Witness the cost of performing a google search:
I have been "playing" with the new Wolfram Alpha computational knowledge engine. My simple computations are likely to leave a small footprint, but I'm betting that there will be some pretty smart grad students who will be sucking a whole lot of energy out of the grid to perform some in depth computations for free using this site. Check it out:
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