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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Check your water heater thermostat. Many manufacturers set thermostats to 140 degrees, although most households only need a setting of 120 degrees. Each 10 degree drop in water temperature can save you between 3 and 5 percent in energy costs.