Lightbulb.
None. We don't address hardware issues.
They don't: They screw in a vacuum.
Significantly more than zero, *p* < .001.
Just one. They hold it in place while the world revolves around them.
A gun has one trigger.
By holding the bulb up to the socket and waiting for the world to revolve around them EDIT: Rip inbox EDIT 2: Thanks for the gold!
A lecture.
Saladdin.