After each time a nozzle fires, a new supply of printer ink is automatically drawn into its chamber, to be ready for the next time. When the printer is told by the computer to print a page, the copper circuits on the end of the ink cartrid…

Mobile phones emit electromagnetic radiation when receiving and making calls. Exposure to high levels of electromagnetic radiation, the likes used in X-ray machines, can be dangerous. However, the amount of radiation produced by mobile ト …