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This week's questions

How do mosquito repellents like coil, mat, cream, sprays keep mosquitoes away?

K. Hari Krishnan, Tuticorin, Tamil Nadu

Why do heavy smokers have darkened lips?

M.J.Prabu, Chennai

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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