A teacher was identifying countries in the world map. A young student stood up and asked, “Sir, would you kindly tell us the weight of the earth?”
Since the teacher did not know the answer, he consulted reference material and on the next day replied, “The weight of the earth is one billion metric tones.”
The same student obediently stood up and asked, “Sir, the weight is with people or without people?”
The teacher was speechless!