I have an electric toothbrush. Somehow, placing the plastic-handled brushing unit into a plastic holder/recharger will recharge the toothbrush unit. If no metal electrical contact is made, how can this recharge the toothbrush?
With bright colors and mesmerizing displays, lava lamps have become a popular icon of pop culture. Watch a quick video and read the article to learn more about the history and science behind these groovy liquid motion lamps.