Yes, although inflight they are not needed as much. They are particularly helpful on the ground during taxi when raining.
Yes on the front wind screen.
like wind shield wipers
No
i think they all do
1903
wind shield wipers
the tiny elves move them back and forth.
None if your are living in Saudi Arabia. :-)
18 years old
Marian Anderson invented the wind shield wipers
Snap them off if you are so dumb as to not be able to stop them the correct way.
18 inch