edit: because they never (that i have known of) want the words double spaced, it's pointless, it doesn't make it easier to read, if anything it'd be harder
When I was in year 8, I had to write a 1000 word creative piece and they asked for it to be "double-spaced". I diligently pressed the spacebar twice in between every single word.
My, haven't we grown since then...??!?!?!?!!?!!! lol