Writes Brian Neal from UC Santa Cruz: "I'm sure someone else has pointed this out already, but as a graduate student in physics, I feel the need to set one of their explanations straight. Their answer to how the light bulb works hasn't been true for over 100 years. They describes 'direct current' (DC), a continuous loop pushing unchanging current around. Modern power systems use 'alternating current' (AC). The power station cyclically pushes and pulls current from the ground (a metal stake in the ground by your house) through the light bulb. Thus there is no return path to the power station (not counting the earth itself). Actually, there isn't even a continuous wire, as transformers only let the electromagnetic fields through without electrical contact. It's ironic that an article attempting to show how little the panel knows distributes an incorrect answer itself."
