A real turn-off at Penn

If you think that simply turning things off and unplugging them doesn't accomplish much, look at what happened at the University of Pennsylvania over winter break.

Penn launched a "Power Down Challenge," which encouraged students to turn down, turn off or unplug appliances.

They did. During the break, the university saw a 7.2 percent reduction in power useage and realized savings of $2,300, officials announced today.

It's worth noting, however, that this was the SECOND year of the challenge. So the overall reduction in power useage compared to two years ago would be much more.