Most people never question it. That strange, pushed‑in circle on the side of your milk jug just sits there, silent and unexplained. But that tiny dent is doing far more work than you think. It’s protecting your fridge, your floor, and possibly your health. Once you learn what it really does, you’ll never look at your milk the sa… Continues… Every time milk shifts from truck to store to fridge, the liquid inside expands and contracts. That unassuming circular dent is a built‑in pressure valve, flexing outward when the milk swells so the jug doesn’t split, leak, or explode in...
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