The grooved "fins" on Stephen Reed's Radiator Mugs ($24) serve more than an aesthetic purpose. If you've ever opened up your car engine or a computer tower, you've seen similar designs on parts that need to stay relatively cool so as not to break down. The grooves allow for a more even distribution of heat, meaning, with this mug, you can hold it right after pouring in hot liquid and not burn your fingers. And early in the morning, when you need that coffee now or someone will get hurt, that can only be a good thing.
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