Military education

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.

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