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The Guardian - UK

Why are hot water bottles ribbed on one side only?

Hot topic ... water bottles. — Hot topic ... water bottles. Photograph: Jose Luis Stephens/EyeEm/Getty Images Photograph: Jose Luis Stephens/Getty Images/EyeEm

Why are hot water bottles ribbed on one side only? Assuming the purpose is to prevent scalding, why protect against the hazard on one side but not the other?

Andy Kirkham, Bristol

Post your answers – and new questions – below or email them to nq@theguardian.com

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