Just one, but it requires someone with a modicum of intelligence to remove the old one and replace it. :)
I did know, but I cant remember
Quite frankly I am not sure. But I know that it takes one ridicliously idiotic racist to tarnish wikianswers' rhetorical questions section.
Hillbillies have lightbulbs?
Well if you'll hold that ladder steady for me, it will just take me a moment.