21.   Heat sources use plutonium heat to keep delicate spacecraft equipment from freezing in the cold of space.

22.   If using electric wok, use high heat.

23.   Laser printers use heat to bond the black powder to paper, while inkjet printers spray ink.

24.   More recently, a balloon device that uses heat to ablate the lining has been introduced.

25.   Pasteurization uses heat to kill microorganisms.

26.   Reno and other federal officials had denied for six years that the devices, which use heat to disperse the tear gas, were used at Waco.

27.   Some of us have used heat to soften the compound, with mixed results and a lot of broken glass.

28.   Sports medicine specialists at Penn State caution against using heat on injured areas that are inflamed or infected or that have lost sensation.

29.   The colder it is outside, the drier the air is inside because more heat is used, and heat lowers the indoor humidity level.

30.   The heat can be used to generate steam for electricity.