Move four matchsticks to the below square to form three squares?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

It belongs to you, but other people use it more than you do. What is it?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is the largest number you can write with just 3 digits?

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

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?