None. That's a hardware problem.
Two. One to actually change the bulb, and the other to videotape so Christians can't claim God did it.
One. We are efficient and don't like humour.
It takes two. One to change the bulb and the other to kick the switch.
None. They just hold it in the socket and expect the world to revolve around them.
int abs = new int23
An Algo-rhythm.
None that's a hardware problem