Logic Riddles

Question: A girl dived in the sea.. some say there are two humans under the sea. Why is that?

Question: A girl dove in the sea.. some say there are two people under the sea. Why is that?

Question: I'm priceless, and cannot be bought, Some seek my purpose, Others destroy me, Those who steal me gain no more, I never last forever, but can a life-time. What am I?

Question: I'm simple for a few people But hard for them to hear I live inside of secrets I bring people's worst fears What am I?

Question: Miss Mary's father had 4 kids: Joseph, John, and Jordan. What was the 4th kid's name?