Answer to last riddle: A hole.
A Japanese ship was sailing in the Pacific Ocean. The Japanese captain took off his diamond chain and put it on the counter to take a shower. Ten minutes later he returned and saw that his diamond chain was missing. He called the crew of the ship together. There were four of them. A British guy was the cook. The captain asked where were you the last ten minutes. The cook answered that he was in the cold storage room to select the meat for lunch. A Sri Lankan was the house keeping guy. The captain repeated his question and the guy said that he was at the top of the ship correcting the flag which had been put upside down. An Indian guy was the engineer maintaining the ship. When the captain asked the same question he answered that he was in the generator room checking the generator. A French guy also served on the house keeping grew. He asked the same question and the guy told him that he was sleeping after the night shift. Within ten seconds the captain knew who had done it. Who did it and how did he know.
