Logic Riddles

Question: A girl dived in the sea.. some say there are two humans 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: Why do cows wear bells?

Question: How many eggs can you put in an empty basket?

Question: A man is twenty years old but has only had five birthdays. How is that possible?