A: It's not a bulb it's a globe.
Two. One to hold the bulb, and another to spin the story until the bulb fits.
Just one to hold the bulb while the world revolves around them.
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Potatoe
A: 22 one to screw it in 21 to shoot the bulb.
None, they don't use light bulbs. They live in caves and use no forms of artificial energy because they wouldn't want to be perceived as hypocrites or morons.