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This week's questions

Why are most of the manholes on roads circular in shape?

R. Benitha, Salem, Tamil Nadu

Why is the nib of a fountain pen split?

S. Alagiavanan, Coimbatore, Tamil Nadu

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Readers can send questions/answers on science and technology for the Question Corner

along with their names and address to the following email id: questioncorner@thehindu.co.in

or to The Editor, The Hindu (Science and Technology), 859-860, Anna Salai, Chennai 600 002.

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