POIN188 RTP SLOT Now that we've got the heat, read on to find out how the hair dryer gets that heat moving. This is why you'll find a wire screen covering the air holes on either side of the dryer. Manufacturers have to predict how their hair dryer might be misused. To prevent this, hair dryers have a heat shield of insulating material that lines the plastic barrel. Other metals like iron rust pretty quickly at the temperatures used in toasters and hair dryers. As the air flows over and through the heated element, the generated heat warms the air by forced convection. For more information on other household appliances showing their warm, fuzzy side -- whether by drying your clothes, toasting your bread or starting your car -- get your motor going on the next page with a bunch of interesting links.|FireWire's MacBook Absence-inconvenience Or Fatal Flaw?