Teflon was invented in 1938 and quickly revolutionized cookware. Today, this coating, or something very much like it, is on three of every four pots and pans in America. But while it is great when it's new, many find the wonder of Teflon soon fades. It's because these folks don't heed the nonstick guideline: extreme high heat can ruin nonstick coatings. Always buy heavier-weight pans. They distribute heat better and last longer. Also, if you cut the coating, it starts coming off, so don't use metal utensils or knives. Cook with wood or nylon utensils, and never use a nonstick cooking spray on Teflon. It builds up oils you can't get off and permanently ruins the pan. Remember the don't S's -- don't scorch, scrape, scratch or use cooking spray and the do S's -- scrub and scour with soap, when through. Stick to these rules and you'll have nonstick pots and pans for years to come. And that's the On The House tip for today.