Only one; However, it takes an entire emergency ward to get it back out again.
One, only **Glorious Leader** gets access to light bulbs
None. Anything not completed during the lesson is added to the homework.
Because he always takes a Pik-at-chu
Inserting a rod into the reactor turns it off.
Helllllllloooooo (insert your mother's/wife's/sister's/grandmother's name here.)