lights

San Francisco is turning the Bay Bridge into a giant LED light show

The annual electricity bill for the project will be an estimated $11,000. That's a lot of electricity -- but just imagine how much higher that bill would be if those 25,000 bulbs were incandescents.

This light switch forces kids to save energy through emotional manipulation

This dimmer switch smiles when the lights are off and frowns when they're on.

Brazilian inmates can reduce their sentence by providing human-powered electricity

Brazil is pioneering a new sort of jailhouse workout, in which inmates ride bikes instead of pumping iron. The bikes, unlike weightlifting or prison-yard basketball, help power a nearby town.