This Mug Keeps Coffee Warm (Not Piping Hot) For Hours On End, Innovation

This Mug Keeps Coffee Warm (Not Piping Hot) For Hours On End, Innovation

An inventor may have perfected a way to make scalding hot coffee or tea instantly warm, and keep it that way

This Mug Keeps Coffee Warm (Not Piping Hot) For Hours On End, Innovation

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The best self-heating coffee mugs in 2022 to keep your drinks warm (or reheat them)