You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

You need to move three matchsticks to form three squares. Can you do it?

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

What does this rebus puzzle means ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

What two things can you never eat for breakfast?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What's a single-digit number with no value?