Answer:
It is everything to someone, and nothing to everyone else. What is it?
Why should you never trust a train?
Why is dark spelled with a “K” and not a “C”?
You can swallow me, but I can also swallow you.
Tax rates and oil prices occasionally take these nature strolls.
I’m hard as a rock and as light as a feather. I’m passed on to one another. Poor people need me and rich people have me.