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Why are some parts of our body warm while some others are cool?

N. Arun kumar, Karur, Tamil Nadu

Why is it difficult to stand than to walk for long duration?

B. Ramesh, Guntur, Andhra Pradesh

Can CDs be classified as diffraction gratings?

S.B.V.R Shastry,

Why is one end of a ball point pen refill always open?

M. Radha, Chennai

Does repeated dyeing of hair cause increased greyness?

S. Joshua, Nagarkoil, Tamil Nadu

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