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How to Choose an Oven That Meets Your Cooking Needs Over the years, ovens have been continuously evolving in design and function. For example, you can now find ovens that automatically clean their liners. These lines warm the interior of the oven, which is useful for cleaning. Some models also have the ability to set a timer which can be set independently of cooking functions. History Since the time humans have existed, we've used fire to keep warm and to cook food. It wasn't