Driving queries

Why is it that the only people with dirty back windsheilds are those with back windsheild wipers? Have you ever noticed that? Sure, the middle is clean. But the edges are completely covered, you can't even see through them. Yet you look at everyone else's car, and you can see through their back windshields just fine. Why is that?

4 way stops. I think everyone has a love-hate relationship with 4 way stops. So here's my question. Are you allowed to go at the same time as the car across from you, even if you got there after the car adjacent to you? Example: you get to a 4 way intersection, and the car directly across from you is about to go. There are cars waiting on both sides of the street adjacent to you. But they can't go yet because it is the turn of the car across from you. So technically, it's stupid for you to just sit there while he goes, and then the other cars go, and then you go. But the rule says that whoever gets there first goes first, so you have to go last. But there's plenty of time for you to go before, and it doesn't interfere with the other folks at all. So are you allowed to go?

Seriously, I have faced this issue several times in the last month, and I never know- half the time I go, half the time I wait, or sometimes it's another car in the situation and I think they're so dumb for sitting there waiting just because they got there last, but shouldn't the rule be that first this side goes, and then that side? Am I making any senses? Any insight would be appreciated.

Tip o' the day: Don't go to bed at your usual time, and wake up 3 hours earlier 4 days in a row. When your fabulous 9+ hours of sleep a night are suddenly cut to 7 or less, it's just not a good situation. Not that I would know....