New Delhi, Sept. 17 -- It's about university days. As usual, while doing M.Sc., I was doing a practical in the lab of Physics Department of Panjab University, Chandigarh.It contained many complex mathematical equations. It was 7 o'clock in the evening. I was tired of solving long equations of Mathematics; the solution was still not coming out. One of my professors, who was there from morning till late in the evening, was also present. I asked my professor, "Sir, where would we use such big mathematical equations in our daily life? What is the use of reading them?"The professor was very fond of drinking tea like me. He said to me, "Let's talk while drinking tea." We went to the canteen for tea.

The professor started talking, every machine...