Why do coffee cups have a second tiny hole in the lid

Why do coffee cups have a second tiny hole in the lid

Why do coffee cups have a second tiny hole in the lid

It often goes unnoticed, but the tiny second hole designed on the lids of takeaway coffee cups plays a vital role in the flow of liquid. 

Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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