Since gas and electricity have become generally available, the wood-burning or coal-burning range has been largely superseded by a wide variety of cooking apparatus, using natural or manufactured gas, oil, acetylene, gasoline, or electricity as fuel. In areas of the world where there is abundant sunshine, solar stoves are becoming increasingly popular. Their heat is supplied by the sun's rays, which are focused by means of a concave reflector. The microwave oven uses radiowaves of high frequency to cook foods very quickly without heating the oven itself.
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