Answer:
I'm tall when I'm young and I'm short when I'm old. What am I?
I am all around you but you cannot see me. I have no throat but you can hear me. Valued during summer but despised in the winter.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
What goes up a chimney down but can't go down a chimney up?
I am the same written forward backward and upside down.
The answer I give is yes, but what I mean is no. What was the question?