Any cartoon you see, where the person is thinking, usually has a light bulb symbol above their head. Now in today's energy independent days it's not a regular light bulb, its CFL.
CFL stands for compact fluorescent light, which is used around the globe in homes as well as offices. The benefits of using this bulb is the life of the bulb is so much longer. The electricity the bulb uses is less, and there is little heat from the bulb.
The disadvantage of the CFL bulb is that it contains mercury. The small trace of high toxic substance that is extremely hazardous if it is digested or even if it is inhaled. If one of these bulbs are broke in your home or business it is not life threatening if handled in the proper way. Young children, pregnant women or even your precious pets are at risk.