Logic Riddles

Question: A ship was travelling in a sea. What is the name of the captain? The answer is in the question.

Question: What is in the middle of a human?

Question: I start at the beginning and I finish at the end I fly through the middle and I return again.

Question: There is a thing that if you put in water and get out, put it back for about 2 minutes, you won't see it again. What is it?

Question: How can you create 3 squares moving exactly 3 sticks?