Logic Riddles

Question: A man was sitting on his couch and searching for the English Channel.

How did he find it?

Question: A cowboy rode to an inn on Friday. He stayed two nights and left on Friday. How could that be?

Question: Swallowing one is fine.
Swallowing two together is fine.
But Swallow them separately and all shall fall.

What are they?

Question: Which is correct "The yolk of the egg is white" or "The egg yolk is white?"

Question: How do you make the number one disappear by adding to it?