There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What does below pictogram mean?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

What is the coolest letter in the alphabet?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What do you call a fish without an eye?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?