As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

How can one talk without saying a single word?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

What goes through cities and fields, but never moves?

What question can you never answer yes to?