"Tom Lombardo posted on March 18, 2013
Many years ago I bought a rechargeable battery-operated toothbrush with its own charging cradle. I noticed that there were no electrodes on the toothbrush or the cradle, and for a moment I wondered how it charged through the plastic. In a flash of inductive reasoning (sorry - I couldn't resist) I realized that the charging cradle and the toothbrush must be magnetically coupled. (This was long before iPhone charging pads.)
Image: PRIMOVE
