If the Earth's magnetism were to be reversed, as scientists claim has happened previously and could happen again, would everything we know and understand be reversed? Would we see ourselves come, or go?
Pole reversals are associated with things like ice ages apparently. I doubt it would sneak up without plenty of warning that human life as we know it was about to be scrubbed out.
Will birds then start flying north in the winter and south in the winter? If North becomes South, will left then change to right, will East become West?