This is a story or anecdote that happened to me some time ago by mail. It is old and I cannot confirm if it is true or not, but it is worth reading anyway, as it reflects how things should be in education.
Sir Ernest Rutherford, President of the British Royal Society and Nobel Prize in Chemistry in 1908, told the following anecdote:
Some time ago, I received a call from a colleague. He was about to give a student a zero for the answer he had given in a physics problem, despite the fact that the student firmly affirmed that his answer was absolutely correct. Teachers and students agreed to request arbitration from someone impartial and I was chosen. I read the test question: 'Show how it is possible to determine the height of a building with the help of a barometer.