21.   Pearce designed a lightweight, flexible mat with flat heating elements sandwiched between layers of polymer.

22.   Set on heating element over high heat, bring to boil, reduce heat, and let simmer until beans are tender but not mushy.

23.   Sensors on the roof detect snow and trigger heating elements in the driveway.

24.   Since the heating element is embedded in the floor slab, radiant floor heating is only practical for single-level houses.

25.   Smooth cooktops feature concealed heating elements beneath the tempered ceramic-glass surface.

26.   So the heating element has to warm up before a page can be printed.

27.   Some bored servicemen have used the heating element of the nutritionally complete but unappealing Meals Ready to Eat to make homemade explosives, several soldiers said Monday.

28.   Special ridges in the nonstick surface channel fat and juices away from the food and the heating element and into a water-filled base to help prevent smoking.

29.   That flaw allowed leaks that undermined the heating elements that were supposed to keep ice from forming on the rail.

30.   The charge then picks up tiny bits of toner, which are deposited onto the paper and then melted into place by a high-temperature heating element.