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* Mathematics professor turned plumber *
A professor of mathematics noticed that his kitchen sink at
his home leaked. He called a plumber. The plumber came the
next day and sealed a few screws, and everything was working as before.
The professor was delighted. However, when the plumber gave
him the bill a minute later, he was shocked.
"This is one-third of my monthly salary!" he yelled.
Well, all the same he paid it and then the plumber said to
him, "I understand your position as a professor. Why don't
you come to our company and apply for a plumber position?
You will earn three times as much as a professor. But
remember, when you apply, tell them that you only completed
primary school. They don't like educated people."
So it happened. The professor got a job as a plumber and his
life significantly improved. He had to seal a screw or
two occasionally, but his salary went up significantly.
One day, the board of the plumbing company decided that
every plumber had to go to evening classes to improve their
education. So, the professor had to go there too. It just
happened that the first class was maths. The evening teacher,
to check students' knowledge, asked for a formula for the
area of a circle. The person he asked was the professor.
He
jumped to the board, and then realised that he had
forgotten the formula. He started to work it out from first principles
and he quickly filled the white board with integrals, differentials
and other advanced formulae. A few minutes later his answer came to
"minus pi times r squared."
He didn't like the minus, so he started all over again. He
got the minus again. No matter how many times he tried, he
always got a minus. He was frustrated. He gave the class a
frightened look and saw all the plumbers whisper: "Switch
the limits of the integral!"
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