This story is actually not mine. I got this from an email forwarded by a friend and I felt that it is only appropriate to share it with others. The story is about a Professor who, on the first day of his class, took an empty glass and filled it with water. In front of his class, he asked his students, "What is this?" Bewildered with the question, the students answered, "a glass filled with water, Sir." "How much do you think does this glass with water weigh?" asked the Professor. Some students shouted, "50 grams!" Others answered, "150 grams?" There seemed to be no consensus. Then the professor held the glass and lifted his hand holding the glass in front of him and asked, "What do you think will happen if I keep on holding this glass for a few minutes?" One student answered, "Well, probably nothing. Your fingers might hurt though." The rest of the class chuckled. Then the professor continued, "Okay, now what ha...