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Bottlenecks: why It's more than just bottles

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A bottle against a beach in Accra, Ghana. [XN Iraki]

A bottle is known for its narrow neck. That restricts the flow of the liquid, be it water, wine or perfume. The narrowing "preserves" the content.

The liquid is not exposed to too much air or dust. Noted if the bottle topples, you can easily save the liquid. The bottle designers deliberately slowed down the outflow of the liquid for a good reason.

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