This week's questions

Why does the colour of mehendi last longer on the nails than on the skin and hair?

P.Syamala Devi, A.P

How do pharmaceutical companies arrive at the expiry date for medicines?

A.Gururajachar, Davangere, Karnataka

Why do we tend to lose our balance when we walk with eyes closed?

P.Habeeb Rahman, Madurai, T.N.

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