How many NC State engineering students does it take to replace an inefficient light bulb with an energy-efficient one?
Five: Three to design a nuclear-powered light bulb that never needs changing, one to install it, and one to write the computer program that controls the wall switch.
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Only 20 percent of homes built before 1980 are properly insulated. You can increase the comfort of your home while reducing heating and cooling needs up to 10 percent by investing in proper insulation and sealing air leaks.
Source: U.S. Department of Energy