What is both possible and impossible at the same time?

People make me, save me, change me, raise me. What am I?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

How many Watermelons are there in the below picture?

What does this Rebus Picture mean?

Look at the picture and find out which square is not linked with any of the other squares.