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This week's questions

What is the origin of hourglass?

R.C.Sridharan, Chennai

Why and how are moles formed in the body?

K.Srinivas, Chennai

What is gyroscope? How is it used in navigation?

D.Gunasekaran, New Delhi

What is the difference between airbreak and vaccum break?

V.V.Bala Subramanyam, A.P.

There has been an overwhelming response from the readers to the `Question Corner'. A question bank has been created by pooling all the questions and answers.

As we publish only two or three questions and answers every week, it may take a few months before your questions are published.

Kindly bear with us for the delay. — Editor

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