Logic Riddles

Question: Two men went into a restaurant. They sat at a table and the waiter came by and asked, "What do you want to drink?"

The first man said, "I'll have H₂0."

The second man said, "I'll have H₂0 too."

The second man died.

Why?

Question: Change a long pause into a short one by doubling a letter.What are the words?

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

What are they?

Question: There's a place in the world where the wind blows south then suddenly north.

Where is it?

Question: I'm teary-eyed but never cry.
Silver-tongued, but never lie.
Double-winged, but never fly.
Air-cooled, but never dry.

What am I?