I was reviewing and correcting an essay that my daughter was writing for school and she informed me that her teacher was instructing her to only put 1 space after a period before the begining of a new sentence. Which of course led to a long discussion about the subject and me telling my daughter to use 2 spaces and if her teacher counts her off for it I would set her teacher straight. The crux of the teacher's reasoning seemed to be that two spaces after the period is a holdover from the typewriter era and was only used because all letters on a type writer were the same width and the 2 spaces made it more readable. Her teacher seemed to think it was not necessary in today's digital world because characters do not all take the same amount of space and they are not needed for readability any more. Your thoughts? Am I an idiot for insisting that my daughter use 2 spaces no matter what her teacher instructs?