10-14-2009, 05:32 AM
This is surely one of the epic unsolved problems of mankind. I think the answer really is....who cares!? Some people have been trained to put two spaces after a period, probably based on their typewriter instructions. Others don't understand why that should be necessary since the computer should be able to decide the spacing after periods. There is no firm rule (you can find style guides that go either way) so the best thing to do is STFU and go find something else in life to turn your attention to.