Most people never stop to question the small round dent on the side of a plastic milk jug. It blends so naturally into the design that it is often dismissed as a random flaw or a harmless imperfection. In reality, this indentation is intentional. It reflects careful engineering aimed at improving durability, safety, and efficiency. Everyday items like milk jugs are designed with precision, balancing low cost, lightweight materials, and structural strength. What appears simple is often the result of thoughtful design decisions that serve multiple practical purposes. One of the key roles of the dent is to help regulate...
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