Ever since the invention of the vacuum, people have had difficulty spelling "vacuum." Is it two "U's" or two "C's"? And then there's the whole "I used apostrophes just now even though those letters aren't possessive" dilemma. Otherwise it would have looked like "Us" and "Cs" and that would have just been MORE confusing! I think we should just go back to calling them "sweepers" like people used to do in the olden days. Or is "sweeper" more of a regional expression, like "soda" versus "pop", rather than an age thing? Yes, I'm done now.