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How to Choose an Oven That Meets Your Cooking Needs Over the years, ovens have improved in terms of design and functionality. For example there are now ovens that self-clean their liner. These lines heat the interior of the oven, which is beneficial to clean. Some models also have a timer that can be set independently of cooking functions. History Since humans have existed, we've used fire to keep warm and to cook food. It wasn't until 1490 that a special oven was built