One, but they'll take 30 visits to do it.
A: None. Each lightbulb contains the means of its own revolution.
Somewhere between 0 and infinity.
Both of them.
Only one; But it takes a WHOLE E.R. room to extract it afterwards. Double joke! "whole... hole." it's a play on words ;)
Because 30 is too many!
Credit to Bo Burnham.
Because he had a crook in his neck.
Hip-pop.
