Logic Riddles

Question: If Paul was born on September 17, 1948, then what year is Paul's birthday?

Question: Fifty is my first, my second is the third in fourth, and my end is the end of an ending. With a nut I become a nut that isn't, and without one I move.

Question: Farrah left her key under the mat and when she came back she lost it.The painter said he painted the wall ,the security said she didn't know, annd the janitor said he cleaned the floor. Who took the key?

Question: I can be seen and heard miles away, only show my position for a couple of seconds, but if touched it can kill you instantly.

Question: 2 Kingdoms are at war. The 1st kingdom are almost out of soldiers. One soldier managed to get in front of the king of the 2nd kingdom, but he didn't kill him. Why?