Good Riddles

Question: You are trying to get your chicken, fox, and wheat to the barn. However, the barn is on the other side of the river. You are on a boat and can only transport one animal or wheat at a time. You must choose carefully not to leave the wrong two together, though. It's either the fox will eat the chicken or the chicken will eat the wheat. How do you take each thing across safely?

Question: What cannot be seen or felt, but can only be broken by voice?

Question: What noise did the robot bee make whilst making honey?

Question: 8,549,176,320 What makes this number unique?

Question: What comes up but never comes down?