Logic Riddles

Question: Two men find an old gold coin and want to have a coin toss with it to decide who gets it. The only problem is the coin is heavier on one side so it comes up heads more than tails. What is a fair way for the men to toss the coin and decide who gets the coin?

Question: I have no bed to sleep or no palace to live. I don't have a single coin then also I am known as king.

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

Question: What are the next two letters in the following series and why? WATNTLITFS__

Question: A man wants to have a party in thirty-one days where he will be serving his 1000 barrels of wine. The only problem is that one of his enemies poisoned one of the barrels. The poison kills any man who drinks any of the wine in about 30 days, give or take a few hours. The man has 10 plants that are also killed by the poison in 30 days and can be used to test the wine. How can identify the single poisoned barrel of wine?