Riddle #135

Question: There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other?

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Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?