Good Riddles

Question: When is a door not a door?

Question: It's the beginning of the universe and the end of every place. It's the beginning of Everything and the end of every race. What am I?

Question: Theres a good barbor and theres a bad barbor, The good barbor has a bad haircut and the bad barbor has a good haircut. Why is that...?

Question: I look green but I am not. I look blue but I am not. I look red but I am not. What am I?

Question: Name 4 ways to calculate 1+1.