15
Mar
An officer reads lectures to a group of soldiers.
When he says: Water boils at 90 degrees one of the soldiers dares to oppose: Sir, water boils at 100 degrees centigrade.
Are you sure?
I am sure, lieutenant.
Ill check it until the next lesson.
The next lesson the officer says: Soldiers, make a correction in your notes from the previous lesson: Water boils at 100 degrees. 90 degrees is right angle.